Patent Publication Number: US-2022218199-A1

Title: Ophthalmic device and ophthalmic optical system

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation application of International Application No. PCT/JP2020/035561, filed Sep. 18, 2020, the disclosure of which is incorporated herein by reference in its entirety. Further, this application claims priority from Japanese Patent Application No. 2019-179050, filed Sep. 30, 2019, the disclosure of which is incorporated herein by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     The present invention relates to an ophthalmic device and an ophthalmic optical system. 
     BACKGROUND ART 
     European Patent Application Publication No. EP 2901919 A1 discloses an ophthalmic device having an attachment lens for capturing an image of a fundus that has a wide field angle. 
     SUMMARY 
     A first aspect of the technique of the present disclosure is an ophthalmic device for observing a subject eye, including: a light source; a scanning section that scans light from the light source; and an objective optical system configured to form a pupil, which has a conjugate relationship with a pupil of the subject eye, at the scanning section, wherein the objective optical system has, in order from the scanning section toward the subject eye, a first lens group that is positive, a second lens group that is positive, and a third lens group that is disposed between the first lens group and the second lens group, and that includes a concave surface configured to diverge light. 
     A second aspect of the technique of the present disclosure is an ophthalmic optical system for observing a subject eye, including an objective optical system configured to forms a pupil having a conjugate relationship with a pupil of the subject eye, wherein the objective optical system has, in order from a side at which the pupil having a conjugate relationship with the pupil of the subject eye is formed, toward the subject eye, a first lens group that is positive, a second lens group that is positive, and a third lens group that includes a concave surface configured to diverge light and that is disposed between the first lens group and the second lens group. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a structural drawing of an ophthalmic device of a first embodiment. 
         FIG. 2  is a schematic structural drawing of an imaging optical system of the first embodiment. 
         FIG. 3  is a structural drawing of an objective lens that structures the imaging optical system. 
         FIG. 4  is a structural drawing illustrating an example of the lens structure of an objective lens relating to Example 1. 
         FIG. 5  is an aberration graph illustrating lateral aberration of the objective lens relating to Example 1. 
         FIG. 6  is a structural drawing illustrating an example of the lens structure of an objective lens relating to Example 2. 
         FIG. 7  is an aberration graph illustrating lateral aberration of the objective lens relating to Example 2. 
         FIG. 8  is a structural drawing illustrating an example of the lens structure of an objective lens relating to Example 3. 
         FIG. 9  is an aberration graph illustrating lateral aberration of the objective lens relating to Example 3. 
         FIG. 10  is a structural drawing illustrating an example of the lens structure of an objective lens relating to Example 4. 
         FIG. 11  is an aberration graph illustrating lateral aberration of the objective lens relating to Example 4. 
         FIG. 12  is a schematic structural drawing illustrating a structure in which an attached optical system relating to a second embodiment is made to be attachable to and removable from a portable terminal. 
         FIG. 13  is a schematic structural drawing illustrating an example of the structure of the attached optical system relating to the second embodiment. 
         FIG. 14  is a schematic structure drawing of an objective lens that structures an imaging optical system of a third embodiment. 
         FIG. 15  is a structural drawing illustrating an example of the lens structure of an objective lens relating to Example 5. 
         FIG. 16  is a schematic structure drawing of an objective lens that structures an imaging optical system of a fourth embodiment. 
         FIG. 17  is a schematic structural drawing of an ophthalmic device of a sixth embodiment. 
         FIG. 18  is a schematic structural drawing of an imaging optical system relating to a first structural example of a seventh embodiment. 
         FIG. 19  is a schematic structural drawing of an imaging optical system relating to a second structural example of the seventh embodiment. 
         FIG. 20  is a schematic structural drawing of an imaging optical system relating to a third structural example of the seventh embodiment. 
         FIG. 21  is a schematic structural drawing of an imaging optical system relating to a fourth structural example of the seventh embodiment. 
         FIG. 22  is a schematic structural drawing of an imaging optical system relating to a fifth structural example of the seventh embodiment. 
         FIG. 23  is a schematic structural drawing of an imaging optical system relating to a sixth structural example of the seventh embodiment. 
         FIG. 24  is a schematic structural drawing of an imaging optical system relating to a seventh structural example of the seventh embodiment. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiments of the present disclosure are described in detail hereinafter with reference to the drawings. 
     First Embodiment 
     An ophthalmic device  110  relating to a first embodiment of the present disclosure is described hereinafter with reference to the drawings. 
     The schematic structure of the ophthalmic device  110  is illustrated in  FIG. 1 . 
     For convenience of explanation, a scanning laser ophthalmoscope is called “SLO”. Further, optical coherence tomography is called “OCT”. 
     Note that the horizontal direction, in a case in which the ophthalmic device  110  is set on a horizontal surface, is the “X direction”, the direction orthogonal to the horizontal surface is the “Y direction”, and the optical axis direction of an imaging optical system  116 A is the “Z direction”. The device is placed, with respect to an subject eye, such that the center of pupil d of the subject eye is positioned on the optical axis that is the Z direction. Further, the X direction, the Y direction and the Z direction are orthogonal to one another. 
     The ophthalmic device  110  includes an imaging device  14  and a control device  16 . The imaging device  14  has a SLO unit  18  that acquires an image of the fundus of an subject eye  12 , and an OCT unit  20  that acquires a tomographic image of the subject eye  12 . Hereinafter, the fundus image that is generated on the basis of the SLO data acquired by the SLO unit  18  is called a SLO image. Further, the tomographic image that is generated on the basis of the OCT data acquired by the OCT unit  20  is called an OCT image. Note that the SLO image is also referred to as a two-dimensional fundus image. Further, the OCT image is also referred to as a fundus tomographic image and an anterior eye portion tomographic image, in accordance with the imaged region of the subject eye  12 . 
     The ophthalmic device  110  is an example of the “ophthalmic device” of the technique of the present disclosure. 
     The control device  16  has a computer having a CPU (Central Processing Unit)  16 A, a RAM (Random Access Memory)  16 B, a ROM (Read Only Memory)  16 C, and an input/output port (I/O)  16 D. 
     The control device  16  has an input/display device  16 E that is connected to the CPU  16 A via the I/O port  16 D. The input/display device  16 E has a graphic user interface that displays the image of the subject eye  12  and receives various instructions from the user. A touch panel display can be used as the input/display device  16 E. The control device  16  also has a communication I/F  16 F that is connected to the I/O port  16 D. 
     Further, the control device  16  has an image processing device  17  that is connected to the I/O port  16 D. The image processing device  17  generates an image of the subject eye  12  on the basis of data obtained by the imaging device  14 . 
     As described above, in  FIG. 1 , the control device  16  of the ophthalmic device  110  has the input/display device  16 E, but the technique of the present disclosure is not limited to this. For example, the control device  16  of the ophthalmic device  110  may not have the input/display device  16 E, and may have a separate input/display device that is physically independent of the ophthalmic device  110 . In this case, the display device has an image processing processor unit that operates under the control of the CPU  16 A of the control device  16 . The image processing processor unit may display the SLO image and the like on the basis of image signals that are outputted and instructed from the CPU  16 A. 
     The imaging device  14  operates under the control of the control device  16 . The imaging device  14  includes the SLO unit  18 , the imaging optical system  116 A and the OCT unit  20 . The imaging optical system  116 A is moved in the X, Y, Z directions by an imaging optical system driving section (not illustrated), under the control of the CPU  16 A. The aligning (positioning) of the imaging device  14  and the subject eye  12  may be carried out, for example, by moving not merely the imaging device  14 , but the entire ophthalmic device  110  in the X, Y, Z directions. 
     A SLO system is realized by the control device  16 , the SLO unit  18  and the imaging optical system  116 A that are illustrated in  FIG. 1 . 
     The SLO unit  18  has plural light sources. For example, as illustrated in  FIG. 1 , the SLO unit  18  has a light source  40  of B light (blue color light), a light source  42  of G light (green color light), a light source  44  of R light (red color light), and a light source  46  of IR light (infrared light (e.g., near infrared light)). The lights that exit from the respective light sources  40 ,  42 ,  44 ,  46  are directed toward the same optical path via respective optical members  48 ,  50 ,  52 ,  54 ,  56 . The optical members  48 ,  56  are mirrors, and the optical members  50 ,  52 ,  54  are beam splitters. The B light is guided via the optical members  48 ,  50 ,  54  to the optical path of the imaging optical system  116 A. The G light is guided via the optical members  50 ,  54  to the optical path of the imaging optical system  116 A. The R light is guided via the optical members  52 ,  54  to the optical path of the imaging optical system  116 A. The IR light is guided via the optical members  56 ,  52  to the optical path of the imaging optical system  116 A. Note that LED light sources or laser light sources can be used as the light sources  40 ,  42 ,  44 ,  46 . Note that an example using laser light sources is described hereinafter. Total reflection mirrors can be used as the optical members  48 ,  56 . Further, dichroic mirrors, half mirrors or the like can be used as the optical members  50 ,  52 ,  54 . 
     The light sources  40 ,  42 ,  44 ,  46  are examples of the “light source” of the technique of the present disclosure. 
     The SLO unit  18  is structured so as to be able to be switched between various light-emitting modes such as a light-emitting mode in which G light, R light, B light and IR light are respectively emitted independently, a light-emitting mode in which these lights are all emitted simultaneously or some thereof are emitted simultaneously, and the like. In the example illustrated in  FIG. 1 , the four light sources that are the light source  40  of B light (blue color light), the light source  42  of G light, the light source  44  of R light, and the light source  46  of IR light are provided, but the technique of the present disclosure is not limited to this. For example, the SLO unit  18  may further have a light source of white light. In this case, in addition to the above-described various light-emitting modes, a light-emitting mode in which only white light is emitted, or the like, may be set. 
     The laser light that is incident on the imaging optical system  116 A from the SLO unit  18  is scanned in the X direction and the Y direction by scanning sections ( 120 ,  142 ) that are described later. The scanning light is illuminated, via pupil  27 , onto the posterior eye portion (e.g., the fundus) of the subject eye  12 . The reflected light that is reflected by the fundus is incident, via the imaging optical system  116 A, onto the SLO unit  18 . 
     The scanning sections ( 120 ,  142 ) are examples of the “scanning sections” of the technique of the present disclosure. 
     The reflected light that is reflected at the fundus of the subject eye  12  is detected by light detecting elements  70 ,  72 ,  74 ,  76  that are provided at the SLO unit  18 . In the present embodiment, the SLO unit  18  has the B light detecting element  70 , the G light detecting element  72 , the R light detecting element  74  and the IR light detecting element  76 , in correspondence with the plural light sources, i.e., the B light source  40 , the G light source  42 , the R light source  44  and the IR light source  46 . The B light detecting element  70  detects the B light that is reflected at the beam splitter  64 . The G light detecting element  72  detects the G light that is transmitted through the beam splitter  64  and reflected at the beam splitter  58 . The R light detecting element  74  detects the R light that is transmitted through the beam splitters  64 ,  58  and is reflected at the beam splitter  60 . The IR light detecting element  76  detects the G light that is transmitted through the beam splitters  64 ,  58 ,  60  and is reflected at the beam splitter  62 . APDs (avalanche photodiodes) are examples of the light detecting elements  70 ,  72 ,  74 ,  76 . 
     Under the control of the CPU  16 A, the image processing device  17  generates SLO images corresponding to the respective colors, by using the signals detected by the B light detecting element  70 , the G light detecting element  72 , the R light detecting element  74  and the IR light detecting element  76 , respectively. The SLO images corresponding to the respective colors are a B-SLO image generated by using the signals detected by the B light detecting element  70 , a G-SLO image generated by using the signals detected by the G light detecting element  72 , an R-SLO image generated by using the signals detected by the R light detecting element  74 , and an IR-SLO image generated by using the signals detected by the IR light detecting element  76 . Further, in the case of the light-emitting mode in which the B light source  40 , the G light source  42  and the R light source  44  emit light simultaneously, an RGB-SLO image may be synthesized from the B-SLO image, the G-SLO image and the R-SLO image that are generated by using the respective signals detected by the R light detecting element  74 , the G light detecting element  72  and the B light detecting element  70 . Further, in the case of the light-emitting mode in which the G light source  42  and the R light source  44  emit light simultaneously, an RG-SLO image may be synthesized from the G-SLO image and the R-SLO image that are generated by using the respective signals detected by the R light detecting element  74  and the G light detecting element  72 . Although an RG-SLO image is used as the SLO image in the first embodiment, the technique of the present disclosure is not limited to this, and another SLO image can be used. 
     Dichroic mirrors, half mirrors or the like can be used for the beam splitters  58 ,  60 ,  62 ,  64 . 
     The OCT system is a three-dimensional image acquiring device that is realized by the control device  16 , the OCT unit  20  and the imaging optical system  116 A that are illustrated in  FIG. 1 . The OCT unit  20  includes a light source  20 A, a sensor (detecting element)  20 B, a first optical coupler  20 C, a reference optical system  20 D, a collimator lens  20 E and a second optical coupler  20 F. 
     The light source  20 A emits light for optical coherence tomography. For example, a super luminescent diode (SLD) can be used as the light source  20 A. The light source  20 A generates low interference light of a broadband light source that has a wide spectral width. The light that exits from the light source  20 A is split at the first optical coupler  20 C. One divisional light is made into parallel light at the collimator lens  20 E as measurement light, and thereafter, is made incident on the imaging optical system  116 A. The measurement light is scanned in the X direction and the Y direction by scanning sections ( 148 ,  142 ) that are described later. The scanning light is illuminated onto the anterior eye portion of the subject eye, or onto the posterior eye portion via the pupil  27 . The measurement light that is reflected by the anterior eye portion or the posterior eye portion goes through the imaging optical system  116 A and is made incident on the OCT unit  20 , and, via the collimator lens  20 E and the first optical coupler  20 C, is incident on the second optical coupler  20 F. Note that, in the present embodiment, an SD-OCT using an SLD is given as an example of the light source  20 A, but the technique of the present disclosure is not limited to this, and an SS-OCT that uses a wavelength sweeping light source may be employed instead of an SLD. 
     The other light, which exits from the light source  20 A and is branched-off at the first optical coupler  20 C, is incident on the reference optical system  20 D as reference light, and goes through the reference optical system  20 D and is incident on the second optical coupler  20 F. 
     The measurement light (returned light) that is reflected and scattered at the subject eye  12 , and the reference light, are combined at the second optical coupler  20 F, and interference light is generated. The interference light is detected at the sensor  20 B. On the basis of a detection signal (OCT data) from the sensor  20 B, the image processing device  17  generates a tomographic image of the subject eye  12 . 
     In the first embodiment, the OCT system generates a tomographic image of the anterior eye portion or the posterior eye portion of the subject eye  12 . 
     The anterior eye portion of the subject eye  12  is the portion that includes, for example, the cornea, the iris, the corner angle, the lens, the ciliary body and a portion of the vitreous body, as the anterior eye segment. The posterior eye portion of the subject eye  12  is the portion that includes, for example, the remaining portion of the vitreous body, the retina, the choroid and the sclera, as the posterior eye segment. Note that the vitreous body that belongs to the anterior eye portion is the portion of the vitreous body that is at the cornea side, with the border being the X-Y plane that passes through the point of the lens that is nearest to the center of the eyeball. The vitreous body that belongs to the posterior eye portion is the portion of the vitreous body that is other than the vitreous body belonging to the anterior eye portion. 
     In a case in which the anterior eye portion of the subject eye  12  is the region that is the object of imaging, the OCT system generates a tomographic image of the cornea for example. Further, in a case in which the posterior eye portion of the subject eye  12  is the region that is the object of imaging, the OCT system generates a tomographic image of the retina for example. 
     The schematic structure of the imaging optical system  116 A is illustrated in  FIG. 2 . The imaging optical system  116 A has an objective lens  130 , the horizontal scanning section  142 , a relay lens device  140 , a beam splitter  147 , the vertical scanning sections  120 ,  148 , a focus adjusting device  150  and the collimator lens  20 E that are disposed in that order from the subject eye  12  side. 
     For example, dichroic mirrors, half mirrors or the like can be used as beam splitters  178 ,  147 . 
     The horizontal scanning section  142  is an optical scanner that scans, in the horizontal direction, the laser light of SLO and the measurement light of OCT that are incident via the relay lens device  140 . In the present embodiment, the horizontal scanning section  142  is shared by the SLO optical system and the OCT optical system, but the technique of the present disclosure is not limited to this. A horizontal scanning section may be provided for each of the SLO optical system and the OCT optical system. 
     The collimator lens  20 E makes, into parallel light, the measurement light that exits from end portion  158  of a fiber through which the light exiting from the OCT unit  20  advances. 
     The focus adjusting device  150  has plural lenses  152 ,  154 . The focus adjusting device  150  adjusts the focus position of the measurement light at the subject eye  12  by moving the plural lenses  152 ,  154  respectively in the optical axis direction appropriately in accordance with the region to be imaged at the subject eye  12 . Note that, although not illustrated, in a case in which a focus detecting device is provided, an autofocus device can be realized by driving the lenses  152 ,  154  by the focus adjusting device in accordance with the state of focal point detection, and carrying out focusing automatically. 
     The vertical scanning section  148  is an optical scanner that scans, in the vertical direction, the measurement light that is incident thereon via the focus adjusting device  150 . 
     The vertical scanning section  120  is an optical scanner that scans, in the vertical direction, the laser light that is incident thereon from the SLO unit  18 . 
     The relay lens device  140  has plural lenses  144 ,  146  that have positive power. The relay lens device  140  is structured by the plural lenses  144 ,  146  such that the positions of the vertical scanning sections  148 ,  120  and the position of the horizontal scanning section  142  are conjugate. More specifically, the relay lens device  140  is structured such that the central positions of the angular scanning of the both scanning sections are conjugate. 
     The beam splitter  147  is disposed between the relay lens device  140  and the vertical scanning section  148 . The beam splitter  147  is an optical member that combines the SLO optical system and the OCT optical system, and reflects the SLO light, which exits from the SLO unit  18 , toward the relay lens device  140 , and transmits the measurement light, which exits from the OCT unit  20 , toward the relay lens device  140 . The measurement light that exits from the OCT unit  20  is two-dimensionally scanned by the vertical scanning section  148  and the horizontal scanning section  142 . Further, the light that exits from the SLO unit  18  is two-dimensionally scanned by the vertical scanning section  120  and the horizontal scanning section  142  that structure the SLO optical system. The OCT measurement light and the SLO laser light that are scanned two-dimensionally are respectively made incident onto the subject eye  12  via the objective lens  130  that structures a shared optical system. The SLO laser light that is reflected at the subject eye  12  goes through the objective lens  130 , the horizontal scanning section  142 , the relay lens device  140 , the beam splitter  147  and the vertical scanning section  120 , and is made incident on the SLO unit  18 . Further, the OCT measurement light that has gone through the subject eye  12  goes through the objective lens  130 , the horizontal scanning section  142 , the relay lens device  140 , the beam splitter  147 , the vertical scanning section  148 , the focus adjusting device  150  and the collimator lens  20 E, and is made incident on the OCT unit  20 . 
     For example, resonant scanners, galvano mirrors, polygon mirrors, rotating mirrors, dove prisms, double dove prisms, rotation prisms, MEMS mirror scanners, acousto-optic elements (AOMs) and the like are suitably used as the horizontal scanning section  142  and the vertical scanning sections  120 ,  148 . In the present embodiment, a galvano mirror is used as the vertical scanning section  148 , and further, a polygon mirror is used as the vertical scanning section  120 . Note that, in a case in which a two-dimensional optical scanner such as a MEMS mirror scanner or the like is used instead of an optical scanner such as a polygon mirror or a galvano mirror or the like, the incident light can be angle-scanned two-dimensionally by that reflecting element, and therefore, the relay lens device  140  may be eliminated. 
     The objective lens  130  has, in order from the horizontal scanning section  142  side, a first lens group  134  and a second lens group  132 . At least the second lens group  132  is, overall, a positive lens group having positive power. In the first embodiment, the first lens group  134  as well is, overall, a positive lens group having positive power. Each of the first lens group  134  and the second lens group  132  has at least one positive lens. In a case in which each of the first lens group  134  and the second lens group  132  has plural lenses, the first lens group  134  and the second lens group  132  may include a negative lens, provided that each of the first lens group  134  and the second lens group  132  has positive power overall. 
     Further, the objective lens  130  of the present disclosure has a third lens group  133  in the space between the first lens group  134  and the second lens group  132 . 
     The first lens group  134  is an example of the “first lens group” of the technique of the present disclosure, the second lens group  132  is an example of the “second lens group” of the technique of the present disclosure, and the third lens group  133  is an example of the “third lens group” of the technique of the present disclosure. 
     The first lens group  134  and the second lens group  132  that structure the objective lens  130  are separated by the longest air gap on optical axis AX between lens surfaces at the objective lens  130 . The third lens group  133  is disposed in the space of this longest air gap. 
     As a result, the gap between the first lens group  134  and the third lens group  133 , and the air gap between the third lens group  133  and the second lens group  132 , are the largest air gap and the second largest air gap among the lens gaps of the entire objective lens  130 . In a case in which the third lens group  133  that is the intermediate group is disposed at the subject eye  12  side between the first lens group  134  and the second lens group  132 , the gap between the first lens group  134  and the third lens group  133  is the largest. In a case in which the third lens group  133  is disposed at the scanning section side, the gap between the third lens group  133  and the second lens group  132  is the largest. Note that, even if there is a glass plate that does not have power at a position between the first lens group  134  and the second lens group  132 , the glass plate is not considered to be a lens that belongs to either the first lens group  134  or the second lens group  132 , and it is considered that the first lens group  134  and the second lens group  132  are separated by the longest air gap. This longest air gap is convenient for providing a combining section that has light combining and light splitting functions such as a dichroic mirror or the like. 
     Note that, although not illustrated, the imaging optical system  116 A can have an optical module that includes a fixation lamp that provides a fixation target, a camera and an illumination device. Such an optical module can be disposed so as to be combined into the optical path of the imaging optical system  116 A by a beam splitter or the like. 
     The imaging optical system  116 A has the objective lens  130  that functions as a posterior eye portion observing optical system that observes the posterior eye portion that includes at least the fundus of the subject eye  12 . Due to the imaging optical system  116 A having an optical module (not illustrated) for anterior eye portion observation that can be inserted onto and removed from the optical path of the objective lens  130 , and the optical module for anterior eye portion observation being placed on the optical path of the objective lens  130 , the imaging optical system  116 A can be switched from the posterior eye portion observing optical system to the anterior eye portion observing optical system. In the first embodiment, the imaging optical system  116 A is described with the focus being on the posterior eye portion observing optical system, and description of the imaging optical system  116 A, which functions as an anterior eye portion observing optical system in which an optical module for anterior eye portion observation is placed on the optical path of the objective lens  130 , is omitted. 
     An example of the concrete structure of the objective lens  130 , which structures the imaging optical system  116 A that functions as a posterior eye portion observing optical system that observes the posterior eye portion of the subject eye  12 , is illustrated in  FIG. 3 . 
     The scanning center positions of the horizontal scanning section  142  and the vertical scanning section  148  illustrated in  FIG. 2  correspond to scanning center position Ps that is illustrated in  FIG. 3 . The objective lens  130  is disposed such that this scanning center position Ps is conjugate with pupil position P 2  of the subject eye  12 . Namely, this is a structure in which the scanning center position Ps of the scanning sections coincides with the pupil position (hereinafter called pupil conjugate position P 1 ) that has a conjugate relationship with the pupil position P 2  of the subject eye  12 . In a SLO optical system, the SLO laser light that is scanned by the vertical scanning section  120  and the horizontal scanning section  142  goes through the objective lens  130  and is angle-scanned two-dimensionally with the pupil position P 2  of the subject eye  12  being the center. As a result, the collected point of the SLO laser light is scanned two-dimensionally at the fundus of the subject eye  12 . Further, at the OCT optical system as well, similarly, the measurement light that is scanned by the vertical scanning section  148  and the horizontal scanning section  142  goes through the objective lens  130  and is angle-scanned two-dimensionally with the pupil position P 2  of the subject eye  12  being the center. As a result, the collected point of the measurement light is scanned two-dimensionally at the fundus of the subject eye  12 . In a case of observing the posterior eye portion, a fundus two-dimensional image is acquired by the SLO unit  18 , and a fundus tomographic image is acquired by the OCT unit  20 . 
     The important point in such a structure is that the light that is supplied to the respective SLO and OCT scanning sections is a parallel light bundle, and the parallel light bundle is angle-scanned at the pupil P 2  of the subject eye by the angular scanning by the scanning section. Therefore, the objective lens  130  must structure an afocal system on the whole. Further, the scanning angle of the parallel light bundle at the pupil P 2  of the subject eye is determined by the scanning angles at the scanning sections and the angular magnification of the objective lens  130 . In this case, for paraxial angular magnification M of the objective lens  130 , a range of around 1.5× to 5× (1.5 □ M □ 5) is preferable. 
     An intermediate pupil position P 3  is formed in the third lens group  133  (G 3 ) that serves as an intermediate group. The light beams illustrated in  FIG. 3  are the respective main light beams of scanning light bundles of five angles up to the maximum angle that are incident on the pupil P 2  of the subject eye  12 , and this is clear from the fact that these main light beams intersect in the third lens group  133  (G 3 ). 
     Specifically, the objective lens  130  functions as an optical system that transfers the scanning center position Ps of the scanning section to the pupil (the pupil position P 2 ) of the subject eye  12 , and has plural lens groups including the first lens group  134  (G 1 ) that is positive and the second lens group  132  (G 2 ) that is positive. The objective lens  130  is structured such that the position (hereinafter called the intermediate pupil position P 3 ), which is in a conjugate relationship with the scanning center position Ps of the scanning section, is formed between the first lens group  134  and the second lens group  132 . Namely, the scanning center position Ps is the pupil conjugate position P 1 , and is conjugate with the pupil position P 2  of the subject eye  12  and the intermediate pupil position P 3 , and the first lens group  134  is a positive lens group, and the second lens group  132  also is a positive lens group. In the example illustrated in  FIG. 3 , the first lens group (G 1 ) includes, in order from the pupil conjugate position P 1  side that is the scanning section side (e.g., the nearest horizontal scanning section  142  side) toward the subject eye  12  side, a positive meniscus lens L 11  whose convex surface faces the scanning section side, a negative lens L 12  whose concave surface faces the scanning section side, a positive meniscus lens L 13  whose concave surface faces the scanning section side, and a lens component (a cemented lens of negative lens L 14  and positive lens L 15 ) that is positive at the scanning section side. Note that “lens component” in the present specification means a lens in which there are two interfaces that contact air on the optical axis. One lens component means one single lens, or one cemented lens that is structured by plural lenses being cemented together. A case in which the lens component of the first lens group  134  is a cemented lens as illustrated is effective for chromatic aberration correction, but the lens component of the first lens group  134  can be made to be a single lens in a case in which the wavelength region of the lights that are used is relatively narrow. 
     The second lens group  132  (G 2 ) includes, in order from the scanning section side toward the subject eye side, a positive lens L 21 , a lens component (a cemented lens of a positive lens L 22  and a negative lens L 23 ) that is shaped as a positive meniscus whose convex surface faces the scanning section side, and a positive meniscus lens L 24  whose convex surface faces the scanning section side. A case in which the meniscus-shaped lens component of the second lens group  132  is a cemented lens as illustrated is effective for chromatic aberration correction, but the lens component of the second lens group  132  can be made to be a single lens in a case in which the wavelength region of the lights that are used is relatively narrow. 
     The third lens group  132  (G 3 ) includes, in order from the scanning section side toward the subject eye side, a lens component (e.g., a cemented lens of a positive lens L 31  and a negative lens L 32 ) that is positive or negative at the scanning section side, a meniscus lens L 33  whose convex surface faces the scanning section side, and a meniscus lens L 34  whose concave surface faces the scanning section side. The third lens group  133  is formed so as to include the intermediate pupil position P 3 . It is preferable for there to be a structure in which the conjugate point P 3  of the pupil is formed between the negative meniscus lens L 33  whose convex surface faces the scanning section side and the meniscus negative lens L 34  whose concave surface faces the scanning section side, i.e., at a position sandwiched between the concave surfaces of the both lenses. 
     Note that the first lens group  134  (G 1 ) and the second lens group  132  (G 2 ) both have positive refractive powers, but it suffices for the third lens group  133  (G 3 ) that serves as an intermediate group to have a strong diverging surface in the vicinity of the intermediate pupil position that is extremely effectively in correcting aberration. Although it is preferable for the refractive power of the third lens group  133  (G 3 ) to mainly be positive, the refractive power can also be negative. 
     Here, due to the imaging optical system  116 A forming a wide angle optical system, observation at a wide field of view FOV at the fundus of the subject eye  12  is realized. The field of view FOV means the range that can be imaged by the imaging device  14 . The field of view FOV can be expressed as the viewing angle. In the first embodiment, the viewing angle can be prescribed by the internal illumination angle and the external illumination angle. The external illumination angle is the illumination angle in which the illumination angle of the light bundle, which is illuminated from the ophthalmic device  110  toward the subject eye  12 , is prescribed by using the pupil  27  as the reference. Further, the internal illumination angle is the illumination angle in which the illumination angle of the light bundle, which is illuminated toward the fundus of the subject eye  12 , is prescribed by using eyeball center O as the reference. The external illumination angle and the internal illumination angle have a corresponding relationship. For example, in a case in which the external illumination angle is 120°, the internal illumination angle corresponds to approximately 160°. 
     In a case of forming the objective lens  130  that has a large wide angle (e.g., a UWF (Ultra Wide Field) exceeding 100°) in order to observe the subject eye  12  in a wide field of view FOV, aberration correction of the objective lens  130  is important, and there is the tendency for curving of the image surface, e.g., the Petzval sum, to increase. Thus, in the first embodiment, at the ultra wide field objective lens  130 , an optical system that can suppress curving of the image surface, e.g., the Petzval sum, is provided. 
     Specifically, in the first embodiment, as an example of the ophthalmic optical system of the present disclosure, the objective lens  130  has the first lens group  134  and the second lens group  132  that respectively have positive power, and the third lens group  133 , which includes a concave surface that diverges light, is disposed between the first lens group  134  and the second lens group  132 . Namely, it suffices to include a concave surface, which is a surface (a diverging surface) at which the direction in which light diverges is from the glass material into a space, between the positive first lens group  134  and the positive second lens group  132 . In other words, the objective lens  130  has the positive first lens group  134  and the positive second lens group  132  in that order from the scanning section side toward the subject eye  12 , and the third lens group  133 , which includes a concave surface that diverges light, is disposed between the first lens group  134  and the second lens group  132 . 
     By forming the objective lens  130  in this way, an increase in the Petzval sum of the objective lens  130  can at least be suppressed. 
     By the way, in a case of forming the objective lens  130  that has a large wide angle (e.g., an ultra wide field (UWF) exceeding 100°) in order to observe the subject eye  12  in a wide field of view FOV, the lens diameter increases in accordance with the field angle increasing. Further, accompanying the increase in the lens diameter, the total amount of the glass material of the lens increases, and the entire weight of the objective lens also increases. Moreover, in a case of forming the objective lens  130 , aberration correction of the objective lens  130  is important, and the operation of the lens system with respect to the pupil that is the object at the objective lens greatly affects the aberration correction of the objective lens  130 . Thus, in the first embodiment, an optical system that makes it possible to reduce the maximum aperture of the objective lens  130  is provided. Specifically, in the first embodiment, as an example of the ophthalmic optical system of the present disclosure, by forming the objective lens  130  so as to incorporate an intermediate pupil into the objective lens  130 , the maximum aperture of the objective lens  130  is reduced. 
     In the first embodiment, at the objective lens  130 , the intermediate pupil, which is different than the pupil that has a conjugate relationship with the pupil of the subject eye  12 , is formed between the first lens group  134  and the second lens group  132 , and the third lens group  133  is disposed so as to include the position of the intermediate pupil. 
     Due to the objective lens being structured so as to form an intermediate pupil in this way, while the image forming performance of the objective lens is improved, an increase in the lens diameter of the objective lens  130  can at least be suppressed, and the total weight of the objective lens  130  due to an increase in the lens diameter can be reduced. Namely, due to the third lens group  133  being disposed so as to include the intermediate pupil position P 3  at the objective lens  130 , the aberration correction function that is due to the concave surface included in the third lens group  133  can be improved. Moreover, due to the concave surface being set near the intermediate pupil position, as compared with a case in which the concave surface is far from the pupil, the diverging operation at this concave surface can be strengthened more, and correction of the Petzval sum is even easier. Accordingly, the various aberrations, which arise at the second lens group that is nearest to the subject eye-side and tends to have a large lens diameter, can be easily corrected by the combining of the first lens group  134  and the third lens group  133 , and excellent performance can be achieved while the UWF objective lens as a whole is compact. 
     By the way, in the structure of the objective lens  130 , it is preferable that the distance to the conjugate position Ps of the pupil of the subject eye at which the scanning section is provided, and further, the distance to the subject eye pupil position P 2  (the so-called working distances) are made to be long. On the other hand, the third lens group  133  is positioned between the first lens group  134  and the second lens group  132 , and there are few constraints on the position thereof provided that the third lens group  133  is disposed so as to include the intermediate pupil position P 3 , and the aberration correcting ability is high. Thus, as illustrated in  FIG. 3  as an example, it is preferable that the objective lens  130  that is structured so as to form an intermediate pupil be structured so as to satisfy following conditional expressions (1), given that the distance between the lens surface, which is included in the first lens group  134  and is furthest from the subject eye  12 , and the position of the scanning section (the pupil conjugate position P 1  that is the scanning center position Ps) (hereinafter, this distance is called the working distance at the scanning section side) is W 1 , and that the distance between the lens surface, which is furthest toward the subject eye  12  side at the second lens group  132 , and the pupil position P 2  of the subject eye (hereinafter, this distance is called the working distance at the subject eye  12  side) is W 2 , and that the distance between the concave surface, which is included in the third lens group  133  and has the strongest diverging power, and the intermediate pupil position P 3  is D. 
         D&lt;W 1, D&lt;W 2  (1)
 
     Namely, the intermediate pupil position P 3 , which is a pupil conjugate position that is different than the pupil conjugate position P 1 , is formed between the pupil conjugate position P 1  at which the scanning section is disposed and the subject eye pupil P 2 , and the gap D, which is between the intermediate pupil position P 3  and concave surface S 3  that is nearest to the intermediate pupil position P 3 , is even smaller than the smallest value among the working distance W 1  at the scanning section side and the working distance W 2  at the subject eye  12  side. 
     By structuring the system in this way, the image forming performance of the objective lens  130  can be improved even more. 
     When considering the aberration of the objective lens  130 , it is preferable to optimize the Petzval image surface. In this case, the Petzval curvature of the lens surface has an effect. 
     Thus, as illustrated as an example in  FIG. 3 , given that the Petzval curvature of concave surface (diverging surface) S 1 , which is nearest to the scanning section in the first lens group  134 , is C 1 , and the Petzval curvature of concave surface (diverging surface) S 2 , which is nearest to the subject eye in the second lens group  132 , is C 2 , and the Petzval curvature of the concave lens surface S 3 , which has diverging power in the third lens group  133 , is C 3 , it is preferable that the objective lens  130  be structured so as to satisfy following conditional expressions (2). 
         C 3&lt; C 1, C 3&lt; C 2  (2)
 
     Here, the above-described Petzval curvature C is computed by following formula (3), where the radius of curvature of that surface is R, and the refractive index of the incident side of that surface N, and the refractive index of the exiting side of that surface is N′. 
         C ={(1/ N ′)−(1/ N )}/(− R )  (3)
 
     Namely, the Petzval curvature C 3  of the concave surface S 3 , which has the strongest diverging power among the concave surfaces of the lenses included in the third lens group  133 , is greater negatively than whichever is greater negatively among the Petzval curvature C 1  of the concave surface S 1 , which has diverging power and is the nearest to the scanning section among the lenses included in the first lens group  134 , and the Petzval curvature C 2  of the concave surface S 2 , which has diverging power and is the nearest to the subject eye  12  among the lenses included in the second lens group  132 . 
     By structuring the system in this way, the image forming performance of the objective lens  130  can be improved even more. Namely, by providing the third lens group  133  that has the pupil conjugate image at the objective lens  130 , the strong diverging surface S 3  can be provided in a vicinity of the pupil conjugate point at this third lens group  133 . Further, by structuring the Petzval curvature C 3  as described above, as compared with an objective lens that does not have the third lens group  133  that has a pupil conjugate image, the Petzval sum of the objective optical system overall that includes the objective lens  130  can be made to be small, and an extremely excellent image forming performance can be achieved. 
     When considering the maximum aperture of the objective lens  130 , the lens that is included in the second lens group  132  that is at the subject eye side has a great effect. On the other hand, in a case of forming the system such that the intermediate pupil is incorporated into the objective lens  130  by the third lens group  133 , the apertures of the lenses included in the third lens group  133  are greater than the second lens group  132 , and therefore, the factor that limits reduction of the maximum aperture of the objective lens  130  is the apertures of the lenses that are included in the third lens group  133 , and this is an obstacle to reducing the maximum aperture of the objective lens  130 . 
     Thus, given that the maximum effective diameter of the lenses included in the first lens group  134  is φ 1 , and the maximum effective diameter of the lenses include in the second lens group  132  is φ 2 , and the maximum effective diameter of the lenses included in the third lens group  133  is φ 3 , it is preferable that the objective lens  130  be structured so as to satisfy following conditional expression (4). 
       φ3,φ1&lt;0.7·φ2  (4)
 
     Namely, the maximum effective diameter φ 1  of the lenses included in the first lens group  134  and the maximum effective diameter φ 3  of the lenses included in the third lens group  133  both are less than 70% of the maximum effective diameter φ 2  of the lenses included in the second lens group  132 . 
     By structuring the system in this way, the objective lens  130  can be made to be compact and lightweight. 
     In accordance with the above-described first embodiment, by structuring the objective lens  130  that satisfies the above-described conditions, the scanning center position Ps of the scanning section (the pupil conjugate position P 1 ) is transferred to the pupil of the subject eye (the pupil position P 2 ) by the objective lens  130 . Further, at the objective lens  130 , conjugate point Po of the pupil (the intermediate pupil position P 3 ) is formed within the third lens group  133 , and the conjugate point Po (the intermediate pupil position P 3 ) is conjugate with the scanning center position Ps (the pupil conjugate position P 1 ) as well. The concave surface (i.e., the diverging surface) at this conjugate point Po (intermediate pupil position P 3 ) is extremely effective in aberration correction (effective in correcting the Petzval sum) of the overall objective lens  130 , and the image forming performance of the objective lens  130  can be improved greatly. Further, the apertures of the first lens group  134  and the second lens group  132  can be made to be small, and the objective lens  130  overall can, although UWF, be made to be compact and lightweight. 
     Note that, in the first embodiment, a case is described in which light is scanned by the horizontal scanning section  142  and the vertical scanning section  148 , and polygon mirrors and galvano mirrors are given as examples of the horizontal scanning section  142  and the vertical scanning section  148 . However, the technique of the present disclosure is not limited to this. For example, another optical element that can scan scanning light in the Y direction may be used, and examples thereof are a MEMS (Micro-electromechanical system) mirror, a rotating mirror, a prism, and a resonant mirror. 
     Further, with regard to the scanning of the scanning light in the first embodiment, similar scanning can, of course, be carried out even if the X direction and the Y direction are switched. 
     SUITABLE EXAMPLES 
     Examples of the objective lens  130  of the technique of the present disclosure are described next. 
     Example 1 
     An example of the lens structure of the objective lens  130  relating to Example 1 is illustrated in  FIG. 4 . The objective lens  130  is a refractive optical system that includes the lenses L 11 ˜L 34 . 
       FIG. 4  illustrates the pupil conjugate position P 1  that is common to the scanning center position Ps of the scanning section, the pupil position P 2  of the subject eye  12 , and the intermediate pupil position P 3  that is the conjugate point Po of the pupil. Note that P 1 , P 2  and P 3  in the drawing are illustrated in order to illustrate positions in the optical axis direction, and the drawing is not intended to illustrate the shapes and sizes thereof. The objective lens  130  includes, in order from the scanning section side, the first lens group  134  (G 1 ) and the second lens group  132  (G 2 ). Further, the third lens group  133  (G 3 ) is disposed between the first lens group  134  (G 1 ) and the second lens group  132  (G 2 ). As described above, the intermediate pupil position P 3  is formed within the third lens group  133  (G 3 ) that serves as an intermediate group. The light beams illustrated in  FIG. 4  are the main light beams of scanning light bundles of the maximum angle that are incident on the pupil P 2  of the subject eye, and this is clear from the fact that these light beams intersect in the third lens group  133  (G 3 ). 
     In the following description, there are cases in which the first lens group  134  is called first lens group G 1 , the second lens group  132  is called second lens group G 2 , and the third lens group  133  is called third lens group G 3 . Note that, in the example illustrated in  FIG. 4 , the third lens group G 3  is disposed in the space that is separated by air gaps between the first lens group G 1  and the second lens group G 2 , and, within the objective lens  130 , the air gap between the third lens group G 3  and the second lens group G 2  is the longest air gap. 
     The first lens group G 1  includes, in order from the pupil conjugate position P 1  side that is the scanning section side toward the subject eye  12  side, the positive meniscus lens L 11  whose concave surface faces the scanning section side, the negative lens L 12  having a concave surface at the scanning section side, the positive lens L 13 , the positive lens L 14  and the negative lens L 15 . The lens L 12  and the lens L 13  are cemented together, and form a lens component that is shaped as a meniscus lens whose concave surface faces the scanning section side. Further, the lens L 14  and the lens L 15  are cemented together, and form a lens component that is shaped as a meniscus lens whose convex surface faces the scanning section side. 
     The second lens group G 2  includes, in order from the scanning section side toward the subject eye side, the positive lens L 21 , the positive lens L 22 , the negative lens L 23  and the positive meniscus lens L 24  whose convex surface faces the scanning section side. The lens L 22  and the lens L 23  are cemented together, and form a lens component that is shaped as a meniscus lens whose concave surface faces the subject eye  12  side. 
     The third lens group G 3  includes, in order from the scanning section side toward the subject eye side, the positive lens  31 , the negative lens L 32 , the meniscus lens L 33  whose convex surface faces the scanning section side, and the meniscus lens L 34  whose concave surface faces the scanning section side. The lens L 31  and the lens L 32  are cemented together, and form a lens component that is shaped as a meniscus lens. Here, the concave lens surface S 3 , which has the strongest diverging power of the above-described third lens group G 3 , is the concave surface at the subject eye side of the negative lens L 33 . 
     Lens data of Example 1 is illustrated in Table 1. The lens data illustrates, in order from the left column, the surface number (No.), the radius of curvature, the surface gap on the optical axis, the refractive index (Nd) based on the d line (wavelength 587.56 nm), and the Abbe number (vd) based on the d line. The 1st surface of the lens data is the pupil conjugate position P 1  that is common to the scanning center position Ps of the scanning section, and is listed as the “aperture” of an imaginary plane (whose radius of curvature is listed as inf) in the table. The value in the final row of the surface gap column expresses the distance, on the optical axis, from the lens surface that is furthest toward the subject eye side in the table to the pupil position P 2 . Note that, because the objective lens  130  is an afocal system, the listings in this table assume a case in which the object is set at infinity. Further, the 7th surface, the 11th surface, the 15th surface and the 20th surface are imaginary planes for performance evaluation of the objective lens  130 , and do not in any way affect that light beam that passes therethrough. 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                   
                 radius of 
                 surface 
                   
                   
               
               
                 No. 
                 curvature 
                 gap 
                 Nd 
                 νd 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 object 
                 inf 
                 inf 
                   
                   
               
               
                 aperture 
                 inf 
                 46.955 
               
               
                 2 
                 −42.7608 
                 8.707 
                 1.740770 
                 27.74 
               
               
                 3 
                 −30.7098 
                 8.932 
               
               
                 4 
                 −224.721 
                 5.304 
                 1.755200 
                 27.57 
               
               
                 5 
                 36.51584 
                 24.840 
                 1.518230 
                 58.82 
               
               
                 6 
                 −49.1996 
                 0.500 
               
               
                 7 
                 inf 
                 0.000 
               
               
                 8 
                 52.47307 
                 31.323 
                 1.744000 
                 44.8 
               
               
                 9 
                 −45.2337 
                 5.073 
                 1.698950 
                 30.13 
               
               
                 10 
                 78.21317 
                 25.000 
               
               
                 11 
                 inf 
                 66.256 
               
               
                 12 
                 17.57037 
                 12.698 
                 1.744000 
                 44.8 
               
               
                 13 
                 −20.7392 
                 5.447 
                 1.755200 
                 27.57 
               
               
                 14 
                 7.885318 
                 2.866 
               
               
                 15 
                 inf 
                 5.000 
               
               
                 16 
                 14.05853 
                 13.432 
                 1.755200 
                 27.57 
               
               
                 17 
                 17.06274 
                 1.361 
               
               
                 18 
                 −24.7894 
                 7.511 
                 1.749500 
                 35.25 
               
               
                 19 
                 −14.3036 
                 159.920 
               
               
                 20 
                 inf 
                 45.000 
               
               
                 21 
                 474.8512 
                 26.060 
                 1.620410 
                 60.25 
               
               
                 22 
                 −118.393 
                 0.500 
               
               
                 23 
                 81.6612 
                 43.103 
                 1.620410 
                 60.25 
               
               
                 24 
                 −83.0378 
                 5.000 
                 1.805180 
                 25.45 
               
               
                 25 
                 573.9011 
                 0.500 
               
               
                 26 
                 36.91632 
                 23.703 
                 1.744000 
                 44.8 
               
               
                 27 
                 61.01281 
                 25.000 
               
               
                   
               
            
           
         
       
     
       FIG. 5  is a lateral aberration graph of the objective lens that is structured by the various items of Table 1. In the lateral aberration graph of  FIG. 5 , image height is on the vertical axis, the solid line illustrates a wavelength of 850.0 nm, the dashed line illustrates 633.0 nm, the one-dot chain line illustrates 532.0 nm, and the two-dot chain line illustrates 486.1327 nm. 
     As is clear from the lateral aberration graph illustrated in  FIG. 5 , it is confirmed that, at the objective lens  130  of Example 1, the dispersion in aberration with respect to lights of a wide wavelength region, which includes light of the visible light wavelength region and light of the near infrared region, is suppressed and is corrected well. 
     Example 2 
     An example of the lens structure of the objective lens  130  relating to Example 2 is illustrated in  FIG. 6 . Note that, because Example 2 has a structure that is similar to Example 1, the same portions are denoted by the same reference numerals, and detailed description thereof is omitted. 
     The first lens group G 1  includes, in order from the pupil conjugate position P 1  side that is the scanning section side toward the subject eye side, the positive meniscus lens L 11  whose convex surface faces the scanning section side, the negative lens L 12  having a concave surface at the subject eye  12  side, the positive meniscus lens L 13  whose concave surface faces the scanning section side, the positive meniscus lens L 14  whose convex surface faces the scanning section side, and the positive lens  15 . The lens L 14  and the lens L 15  are cemented together, and form a lens component of a biconvex shape. 
     The second lens group G 2  includes, in order from the scanning section side toward the subject eye side, the positive lens L 21 , the positive lens L 22 , the negative lens L 23  and the positive meniscus lens L 24  whose convex surface faces the scanning section side. The lens L 22  and the lens L 23  are cemented together, and form a lens component that is shaped as a meniscus lens whose concave surface faces the subject eye  12  side. 
     The third lens group G 3  includes, in order from the scanning section side toward the subject eye side, the positive lens  31 , the negative meniscus lens L 32  whose concave surface faces the scanning section side, the lens L 33  whose convex surface faces the scanning section side, and the meniscus lens L 34  whose convex surface faces the subject eye  12  side. The lens L 31  and the lens L 32  are cemented together, and form a positive lens component. Here, the concave lens surface S 3 , which has the strongest diverging power of the above-described third lens group G 3 , is the concave surface at the subject eye side of the negative lens L 33 . 
     Lens data of Example 2 is illustrated in Table 2. 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 2 
               
               
                   
               
               
                   
                 radius of 
                 surface 
                   
                   
               
               
                 No. 
                 curvature 
                 gap 
                 Nd 
                 νd 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 object 
                 inf 
                 inf 
                   
                   
               
               
                 aperture 
                 inf 
                 20.000 
               
               
                 2 
                 30.12349 
                 6.632 
                 1.785900 
                 44.17 
               
               
                 3 
                 62.11636 
                 10.184 
               
               
                 4 
                 −335.629 
                 5.000 
                 1.846660 
                 23.8 
               
               
                 5 
                 35.49029 
                 6.949 
               
               
                 6 
                 −69.3516 
                 10.485 
                 1.755000 
                 52.34 
               
               
                 7 
                 −27.9288 
                 0.500 
               
               
                 8 
                 204.6868 
                 5.000 
                 1.698950 
                 30.13 
               
               
                 9 
                 31.00309 
                 23.471 
                 1.755000 
                 52.34 
               
               
                 10 
                 −74.2074 
                 30.000 
               
               
                 11 
                 inf 
                 54.116 
               
               
                 12 
                 46.2911 
                 16.902 
                 1.755000 
                 52.34 
               
               
                 13 
                 −32.6508 
                 5.000 
                 1.846660 
                 23.8 
               
               
                 14 
                 −364.222 
                 26.645 
               
               
                 15 
                 11.66935 
                 7.439 
                 1.850260 
                 32.35 
               
               
                 16 
                 7.539325 
                 4.349 
               
               
                 17 
                 −14.4018 
                 16.764 
                 1.640000 
                 60.19 
               
               
                 18 
                 −15.1784 
                 166.985 
               
               
                 19 
                 inf 
                 46.561 
               
               
                 20 
                 245.4849 
                 28.161 
                 1.620410 
                 60.25 
               
               
                 21 
                 −191.188 
                 0.500 
               
               
                 22 
                 84.21076 
                 50.485 
                 1.620410 
                 60.25 
               
               
                 23 
                 −113.415 
                 5.000 
                 1.846660 
                 23.8 
               
               
                 24 
                 447.2304 
                 0.500 
               
               
                 25 
                 40.128 
                 27.364 
                 1.754998 
                 52.32 
               
               
                 26 
                 61.01281 
                 25.000 
               
               
                   
               
            
           
         
       
     
       FIG. 7  is a lateral aberration graph of the objective lens that is structured by the various items of Table 2. 
     As is clear from the lateral aberration graph illustrated in  FIG. 7 , it is confirmed that, at the objective lens  130  of Example 2, the dispersion in aberration with respect to lights of a wide wavelength region, which includes light of the visible light wavelength region and light of the near infrared region, is suppressed and is corrected well. 
     Example 3 
     An example of the lens structure of the objective lens  130  relating to Example 3 is illustrated in  FIG. 8 . Note that, because Example 3 has a structure that is similar to Example 1, the same portions are denoted by the same reference numerals, and detailed description thereof is omitted. 
     The first lens group G 1  includes, in order from the pupil conjugate position P 1  side that is the scanning section side toward the subject eye  12  side, the positive meniscus lens L 11  whose concave surface faces the scanning section side, the negative lens L 12 , the positive lens L 13 , the positive lens L 14 , and the negative lens L 15  whose concave surface faces the scanning section side. The lens L 12  and the lens L 13  are cemented together, and form a lens component that is shaped as a meniscus lens whose concave surface faces the scanning section side. Further, the lens L 14  and the lens L 15  are cemented together, and form a lens component that is shaped as a meniscus lens whose convex surface faces the scanning section side. 
     The second lens group G 2  includes, in order from the scanning section side toward the subject eye side, the positive lens L 21 , the positive lens L 22 , the negative lens L 23  and the positive meniscus lens L 24  whose convex surface faces the scanning section side. The lens L 22  and the lens L 23  are cemented together, and form a lens component that is shaped as a meniscus lens whose convex surface faces the scanning section side. 
     The third lens group G 3  includes, in order from the scanning section side toward the subject eye side, the positive lens  31 , the negative lens L 32 , the meniscus lens L 33  whose concave surface faces the scanning section side, and the meniscus lens L 34  whose concave surface faces the scanning section side. The lens L 31  and the lens L 32  are cemented together, and form a lens component that is shaped as a meniscus lens whose convex surface faces the scanning section side. Here, the concave lens surface S 3 , which has the strongest diverging power of the above-described third lens group G 3 , is the concave surface at the subject eye side of the meniscus lens L 33 . 
     Lens data of Example 3 is illustrated in Table 3. 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 3 
               
               
                   
               
               
                   
                 radius of 
                 surface 
                   
                   
               
               
                 No. 
                 curvature 
                 gap 
                 Nd 
                 Nd 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 object 
                 inf 
                 inf 
                   
                   
               
               
                 aperture 
                 inf 
                 45.000 
               
               
                 2 
                 −42.4275 
                 8.993 
                 1.700000 
                 48.1 
               
               
                 3 
                 −29.6815 
                 10.321 
               
               
                 4 
                 −145.84 
                 5.000 
                 1.795040 
                 28.69 
               
               
                 5 
                 39.26125 
                 23.733 
                 1.579570 
                 53.74 
               
               
                 6 
                 −51.579 
                 1.575 
               
               
                 7 
                 77.20313 
                 30.604 
                 1.744000 
                 44.8 
               
               
                 8 
                 −35.9779 
                 5.000 
                 1.698950 
                 30.13 
               
               
                 9 
                 −36628.8 
                 30.000 
               
               
                 10 
                 inf 
                 54.000 
               
               
                 11 
                 18.21663 
                 9.908 
                 1.834000 
                 37.18 
               
               
                 12 
                 −18.5816 
                 15.403 
                 1.846660 
                 23.8 
               
               
                 13 
                 14.15261 
                 1.457 
               
               
                 14 
                 −6.90368 
                 5.526 
                 1.902000 
                 25.26 
               
               
                 15 
                 −8.39297 
                 18.701 
               
               
                 16 
                 −44.3231 
                 25.181 
                 1.743200 
                 49.26 
               
               
                 17 
                 −41.3408 
                 122.844 
               
               
                 18 
                 inf 
                 54.728 
               
               
                 19 
                 299.3385 
                 23.025 
                 1.696797 
                 55.53 
               
               
                 20 
                 −224.23 
                 0.500 
               
               
                 21 
                 84.28155 
                 51.896 
                 1.696797 
                 55.53 
               
               
                 22 
                 −102.322 
                 5.000 
                 1.846660 
                 23.8 
               
               
                 23 
                 192.8745 
                 0.500 
               
               
                 24 
                 40.93564 
                 26.098 
                 1.883000 
                 40.66 
               
               
                 25 
                 61.01281 
                 25.000 
               
               
                   
               
            
           
         
       
     
       FIG. 9  is a lateral aberration graph of the objective lens that is structured by the various items of Table 3. 
     As is clear from the lateral aberration graph illustrated in  FIG. 9 , it is confirmed that, at the objective lens  130  of Example 3, the dispersion in aberration with respect to lights of a wide wavelength region, which includes light of the visible light wavelength region and light of the near infrared region, is suppressed and is corrected well. 
     Example 4 
     An example of the lens structure of the objective lens  130  relating to Example 4 is illustrated in  FIG. 10 . Note that, because Example 4 has a structure that is similar to Example 1, the same portions are denoted by the same reference numerals, and detailed description thereof is omitted. 
     The first lens group G 1  includes, in order from the pupil conjugate position P 1  side that is the scanning section side toward the subject eye  12  side, the negative meniscus lens L 11  whose convex surface faces the scanning section side, the positive lens L 12 , the negative lens L 13 , the positive lens L 14  and the positive lens L 15 . The lens L 11  and the lens L 12  are cemented together, and form a positive lens component having a biconvex shape. Further, the 9th surface, which is the surface at the subject eye  12  side of the lens L 15 , is formed by an aspherical surface. 
     The second lens group G 2  includes, in order from the scanning section side toward the subject eye side, the positive lens L 21 , the positive lens L 22 , the negative lens L 23  and the positive meniscus lens L 24  whose convex surface faces the scanning section side. The lens L 22  and the lens L 23  are cemented together, and form a lens component that is shaped as a meniscus lens whose convex surface faces the scanning section side. 
     The third lens group G 3  includes, in order from the scanning section side toward the subject eye side, the positive lens  31 , the negative meniscus lens L 32  whose concave surface faces the scanning section side, the meniscus lens L 33  whose convex surface faces the scanning section side, the negative lens  34  and the positive lens  35 . The lens L 31  and the lens L 32  are cemented together, and form a positive lens component having a biconvex shape. The lens L 34  and the lens L 35  are cemented together, and form a lens component that is shaped as a meniscus lens whose concave surface faces the scanning section side. Here, the concave lens surface S 3 , which has the strongest diverging power of the above-described third lens group G 3 , is the concave surface at the subject eye side of the negative lens L 33 . 
     Lens data of Example 4 is illustrated in Table 4. 
     
       
         
           
               
               
               
               
               
               
             
               
                 TABLE 4 
               
               
                   
               
               
                   
                   
                 radius of 
                 surface 
                   
                   
               
               
                 No. 
                   
                 curvature 
                 gap 
                 Nd 
                 Nd 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 object 
                   
                 1.00E+18 
                 1.00E+20 
                   
                   
               
               
                 aperture 
                   
                 1.00E+18 
                 45.000 
               
               
                 2 
                   
                 56.34893 
                 5.000 
                 1.755200 
                 27.57 
               
               
                 3 
                   
                 33.2776 
                 21.815 
                 1.622800 
                 57.1 
               
               
                 4 
                   
                 −49.7487 
                 0.500 
               
               
                 5 
                   
                 −386.18 
                 5.000 
                 1.755200 
                 27.57 
               
               
                 6 
                   
                 36.34466 
                 5.521 
               
               
                 7 
                   
                 87.77264 
                 13.353 
                 1.620410 
                 60.25 
               
               
                 8 
                   
                 −50.9255 
                 0.548 
               
               
                 9 
                 aspherical 
                 57.4878 
                 9.271 
                 1.487490 
                 70.32 
               
               
                   
                 surface 
               
               
                 10 
                   
                 1.65E+17 
                 25.000 
               
               
                 11 
                   
                 1.00E+18 
                 55.000 
               
               
                 12 
                   
                 42.40217 
                 11.666 
                 1.487490 
                 70.32 
               
               
                 13 
                   
                 −24.0717 
                 5.000 
                 1.755200 
                 27.57 
               
               
                 14 
                   
                 −59.5375 
                 0.500 
               
               
                 15 
                   
                 14.13321 
                 18.840 
                 1.744000 
                 44.8 
               
               
                 16 
                   
                 8.65902 
                 1.531 
               
               
                 17 
                   
                 −14.5189 
                 24.664 
                 1.795040 
                 28.69 
               
               
                 18 
                   
                 43.25015 
                 14.383 
                 1.688930 
                 31.16 
               
               
                 19 
                   
                 −23.569 
                 135.347 
               
               
                 20 
                   
                 1.00E+18 
                 58.712 
               
               
                 21 
                   
                 490.9155 
                 24.760 
                 1.620410 
                 60.25 
               
               
                 22 
                   
                 −176.971 
                 0.500 
               
               
                 23 
                   
                 92.26245 
                 56.343 
                 1.620410 
                 60.25 
               
               
                 24 
                   
                 −100.651 
                 5.000 
                 1.755200 
                 27.57 
               
               
                 25 
                   
                 1170.956 
                 0.500 
               
               
                 26 
                   
                 39.79969 
                 31.239 
                 1.620410 
                 60.25 
               
               
                 27 
                   
                 61.01281 
                 25.000 
               
               
                   
               
            
           
         
       
     
     At the aspherical surface listed in Table 4, given that the height in the direction orthogonal to the optical axis is h, the distance (sag amount) along the optical axis from the tangent plane at the apex of the aspherical surface to the position on the aspherical surface at height his zs, the inverse of the radius of curvature of the near axis is c, the constant of the cone is k, the 4th-order aspherical coefficient is A, the 6th-order aspherical coefficient is B, the 8th-order aspherical coefficient is C, the 10th-order aspherical coefficient is D and the 12th-order aspherical coefficient is E, zs is expressed by the following formula. 
         zs =( c·h   2 )/[1+{1−(1+ k )· h   2   ·c   2 } 1/2 ] A·h   4   +B·h   6   +C·h   8   +D·h   10   +E·h   12  
 
     The aspherical coefficients of the aspherical surfaces in Example 4 are listed in Table 5. In the table, the aspherical coefficients from A on are listed as the orders. “E−n” (n is an integer) in the table means “×10 −n ”. 
     
       
         
           
               
             
               
                 TABLE 5 
               
               
                   
               
               
                 surface 9: aspherical surface 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                   
                 conic constant 
                 0 
               
               
                   
                 4th-order 
                 −2.5207E−05 
               
               
                   
                 6th-order 
                  3.0418E−07 
               
               
                   
                 8th-order 
                 −2.2241E−09 
               
               
                   
                 10th-order 
                  1.0231E−11 
               
               
                   
                 12th-order 
                 −3.0965E−14 
               
               
                   
                 14th-order 
                  6.1327E−17 
               
               
                   
                 16th-order 
                 −7.6047E−20 
               
               
                   
                 18 th-order 
                  5.3451E−23 
               
               
                   
                 20th-order 
                 −1.6247E−26 
               
               
                   
                   
               
            
           
         
       
     
       FIG. 11  is a lateral aberration graph of the objective lens that is structured by the various items of Table 4 and Table 5. 
     As is clear from the lateral aberration graph illustrated in  FIG. 11 , it is confirmed that, at the objective lens  130  of Example 4, the dispersion in aberration with respect to lights of a wide wavelength region, which includes light of the visible light wavelength region and light of the near infrared region, is suppressed and is corrected well. 
     Next, the conformance of the above conditional expressions with the objective lenses in the respective Examples of above-described Example 1 through Example 4 is described. Values relating to the above conditional expressions for Example 1 through Example 4 respectively are listed in Table 6. 
     
       
         
           
               
               
               
               
               
             
               
                   
                 TABLE 6 
               
               
                   
                   
               
               
                   
                 Example 1 
                 Example 2 
                 Example 3 
                 Example 4 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 D 
                 13.82 (14) 
                 3.31 (16) 
                 1.93 (14) 
                 5.26 (16) 
               
               
                 (surface no.) 
               
               
                 W1 
                 46.95 
                 20.00 
                 45.00 
                 45.00 
               
               
                 W2 
                 25.00 
                 25.00 
                 25.00 
                 25.00 
               
               
                 C1 
                 −0.00995 
                 0.0146 
                 −0.00971 
                 0.00764 
               
               
                 C2 
                 −0.00699 
                 −0.00705 
                 −0.00769 
                 −0.00628 
               
               
                 C3 
                 −0.05457 
                 −0.061 
                 −0.0687 
                 −0.0493 
               
               
                 ϕ1 
                 68 
                 53 
                 65 
                 49 
               
               
                 ϕ2 
                 125 
                 140 
                 134 
                 144 
               
               
                 ϕ3 
                 24 
                 39 
                 43 
                 35 
               
               
                 M 
                 2.1 
                 2.1 
                 2.2 
                 2.1 
               
               
                 f3 
                 64.01 
                 73.56 
                 61.92 
                 63.13 
               
               
                   
               
            
           
         
       
     
     As is clear from Table 6, it is clear that the objective lenses of Example 1 through Example 4 are in conformance with the above conditional expressions. 
     Second Embodiment 
     A second embodiment is described next. In the second embodiment, the objective lens  130 , which is the main portion of the imaging optical system  116 A relating to the first embodiment, is formed as an attached optical system, and can be attached to and removed from a portable terminal that has an imaging function. Because the structure of the second embodiment is substantially similar to the first embodiment, the same portions are denoted by the same reference numerals, and description thereof is omitted, and mainly the portions that are different are described. 
       FIG. 12  illustrates an example of a structure in which an attached optical system  300  relating to the second embodiment can be attached to and removed from a portable terminal  400  that has an imaging function. 
     As illustrated in  FIG. 12 , the portable terminal  400  has an imaging section  402  for realizing the imaging function. The imaging section  402  operates in a usual imaging mode, in which the imaging section  402  captures an image of a subject at infinity such as a landscape or the like, by user operation of an unillustrated operation portion that the portable terminal  400  has. Namely, the imaging section  402  of the portable terminal  400  has a lens  404  for a portable terminal ( FIG. 13 ), and is structured so as to, by operation in the usual imaging mode, form an image on an imaging element  406  ( FIG. 13 ) when parallel light is incident. 
       FIG. 13  illustrates an example of the structure of the attached optical system  300  relating to the second embodiment. A state in which the attached optical system  300  is attached to the portable terminal  400  is illustrated in  FIG. 13 . The attached optical system  300  has the first lens group G 1 , the second lens group G 2  and the third lens group G 3  that structure the above-described objective lens  130 . Because the structures and functions of these respective lens groups are similar to the first embodiment, detailed description thereof is omitted. 
     At the attached optical system  300  relating to the second embodiment, the point that an illuminating portion  304  that emits illumination light, and a half mirror  302  that guides the illumination light that is from the illuminating portion to the optical path that runs along the optical axis AX, are provided at the objective lens  130  relating to the first embodiment, is different. The illuminating portion  304  emits the illumination light that illuminates the subject eye  12 . The half mirror  302  guides the illumination light that is from the illuminating portion  304  to the optical path that runs along the optical axis AX. 
     Note that, in a case in which the portable terminal  400  has a subject illuminating portion that illuminates the subject, it suffices for the attached optical system  300  to, instead of the illuminating portion  304  and the half mirror  302 , employ the illumination light that is emitted from the subject illuminating portion, and have an optical system that guides the illumination light that is from the subject illuminating portion to the optical path that runs along the optical axis AX. Further, the illuminating portion  304  may be an independent structure, and not be provided at the attached optical system  300 . 
     The attached optical system  300  has an attaching portion  306  that attaches the attached optical system  300  to the portable terminal  400 , in order to form a structure in which the attached optical system  300  and the portable terminal  400  can be attached and removed. Due to the attached optical system  300  having this attaching portion  306 , a structure in which the attached optical system  300  can be attached to and removed from the portable terminal  400  becomes possible. 
     The first lens group G 1  and the second lens group G 2  that are included in the attached optical system  300  function as an objective optical system  301  that forms a pupil that has a conjugate relationship with the pupil of the subject eye  12 . The attached optical system  300  and the portable terminal  400  are fixed by the attaching portion  306  such that the incident pupil of the imaging section  402  of the portable terminal  400  is positioned at the position (the pupil conjugate position P 1 ) of the pupil that is in a conjugate relationship with the pupil of the subject eye  12  formed by the objective optical system  301 . 
     By structuring the system in this way, a fundus image of the subject eye  12  can be imaged by the simple structure of merely attaching the attached optical system  300  to the portable terminal  400 . 
     Third Embodiment 
     A third embodiment is described next. 
     In the first embodiment, the imaging optical system  116 A, which functions as a posterior eye portion observing optical system that observes the posterior eye portion of the subject eye  12 , is mainly described. The third embodiment is formed so as to be able to switch so as to function as an anterior eye portion observing optical system that observes the anterior eye portion of the subject eye  12 , by inserting an optical module for anterior eye portion observation into the imaging optical system  116 A that functions as the posterior eye portion observing optical system relating to the first embodiment. Because the structure of the third embodiment is substantially similar to the first embodiment, the same portions are denoted by the same reference numerals, and description thereof is omitted, and the portions that differ are mainly described. 
       FIG. 14  illustrates an example of the structure of the objective lens  130  at the imaging optical system  116 A relating to the third embodiment. The imaging optical system  116 A relating to the third embodiment has the objective lens  130  that can switch between a posterior eye portion observing optical system and an anterior eye portion observing optical system. The objective lens  130  has, in order from the scanning section (e.g., the horizontal scanning section  142 ) side, the first lens group  134  and the second lens group  132 , and has the third lens group  133  in the space between the first lens group  134  and the second lens group  132 . The structures of these first lens group  134  (G 1 ), second lens group  132  (G 2 ) and third lens group  133  (G 3 ) are similar to the first embodiment, and therefore, detailed description thereof is omitted. 
     The imaging optical system  116 A has an optical module  136  for anterior eye portion observation that can be inserted onto and removed from the optical path of the objective lens  130 . Due to the optical module for anterior eye portion observation being placed on the optical path of the objective lens  130 , the imaging optical system  116  can switch from an optical system for posterior eye portion observation to an optical system for anterior eye portion observation. Specifically, as illustrated in  FIG. 14 , the optical module  136  for anterior eye portion observation is inserted onto the optical path of the objective lens  130 , e.g., on the optical path between the first lens group  134  (G 1 ) that has positive refractive power and the second lens group  132  (G 2 ) that has positive refractive power, which structure the objective lens  130 . Preferably, as illustrated in  FIG. 14 , the optical module  136  for anterior eye portion observation is inserted between the second lens group  132  (G 2 ) and the third lens group  133  (G 3 ). 
     The optical module  136  has, at the interior thereof, an optical element including a lens  162  that serves as a switching lens and has negative power. When the lens  162  is placed on the optical axis of the objective lens  130 , the lens  162  operates as a switching lens for switching a posterior eye portion observing optical system  300  to an anterior eye portion observing optical system  400 . In a case in which the lens  162  is inserted on the optical path of the objective lens  130 , the scanning position (the scanning center position Ps) of the scanning section (e.g., the horizontal scanning section  142 ) and the pupil position P 3  of the subject eye  12  are not conjugate, and the parallel light from the scan position of the scanning section is collected at the anterior eye portion. The diameter of the light bundle that passes through the lens  162  is smaller than the diameters of the light bundles that pass through the first lens group  134  and the second lens group  132 , respectively. Accordingly, the effective diameter of the lens  162  is small as compared with the effective diameters of the lens groups that structure the objective lens  130 . Therefore, the optical module  136  can be structured to be compact. Note that the optical element is not limited to the lens  162  that has negative power, and, instead of the lens  162 , an optical member such as, for example, a Fresnel lens, a DOE (Diffractive Optical Element) or the like may be used. 
     More specifically, the imaging optical system  116 A is a structure in which the optical module  136  for anterior eye portion observation can be inserted onto and removed from the optical path of the objective lens  130 , which is the optical path of an observing optical system for posterior eye portion observation, either manually by an operator (e.g., an ophthalmologist) or automatically. In a case in which the optical module  136  is not disposed on the optical path of the objective lens  130 , a posterior eye portion observing optical system is structured as the observing optical system, and the ophthalmic device  110  acquires an image of the posterior eye portion of the subject eye  12  thereby. On the other hand, in a case in which the optical module  136  is inserted on the optical path of the objective lens  130 , an anterior eye portion observing optical system is structured as the observing optical system, and the ophthalmic device  110  acquires an image of the anterior eye portion of the subject eye  12  thereby. 
     Note that the optical module  136  for anterior eye portion observation may have an eye tracking module that tracks the sightline direction and is used at the time of anterior eye portion observation, a fixation lamp that guides the sightline direction of the subject eye  12 , a camera, and an illumination device. 
     As described above, in accordance with the third embodiment, by inserting and removing the optical module  136  for anterior eye portion observation onto and from the optical path of the objective lens  130  that functions as an observing optical system for posterior eye portion observation, the imaging optical system  116 A can be instantaneously switched between an anterior eye portion observing optical system that observes the anterior eye portion of the subject eye  12  and a posterior eye portion observing optical system that observes the posterior eye portion. 
     Suitable Example 
     An Example of the objective lens  130  relating to the third embodiment is described next. 
     Example 5 
       FIG. 15  illustrates an example of the lens structure of the objective lens  130  relating to Example 5. Note that, because Example 5 has a structure that is similar to Example 2, the same portions are denoted by the same reference numerals, and detailed description thereof is omitted. In Example 5, the point that the lens  136  that is included in the optical module  136  for anterior eye portion observation is added between the second lens group  132  and the third lens group  133  in the structure of Example 2, is different. 
     In Example 5, a negative lens L 41  is disposed between the second lens group G 2  and the third lens group  133 , and specifically, between the positive lens L 21  and the negative lens L 34 . 
     Lens data of Example 5 is illustrated in Table 7. 
     
       
         
           
               
               
               
               
               
             
               
                   
                 TABLE 7 
               
               
                   
                   
               
               
                   
                 radius of 
                 surface 
                   
                   
               
               
                   
                 curvature 
                 gap 
                 Nd 
                 Nd 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 object 
                 inf 
                 inf 
                   
                   
               
               
                 aperture 
                 inf 
                 20.000 
               
               
                 2 
                 30.12349 
                 6.632 
                 1.785900 
                 44.17 
               
               
                 3 
                 62.11636 
                 10.184 
               
               
                 4 
                 −335.629 
                 5.000 
                 1.846660 
                 23.8 
               
               
                 5 
                 35.49029 
                 6.949 
               
               
                 6 
                 −69.3516 
                 10.485 
                 1.755000 
                 52.34 
               
               
                 7 
                 −27.9288 
                 0.500 
               
               
                 8 
                 204.6868 
                 5.000 
                 1.698950 
                 30.13 
               
               
                 9 
                 31.00309 
                 23.471 
                 1.755000 
                 52.34 
               
               
                 10 
                 −74.2074 
                 30.000 
               
               
                 11 
                 inf 
                 54.116 
               
               
                 12 
                 46.2911 
                 16.902 
                 1.755000 
                 52.34 
               
               
                 13 
                 −32.6508 
                 5.000 
                 1.846660 
                 23.8 
               
               
                 14 
                 −364.222 
                 26.645 
               
               
                 15 
                 11.66935 
                 7.439 
                 1.850260 
                 32.35 
               
               
                 16 
                 7.539325 
                 4.349 
               
               
                 17 
                 −14.4018 
                 16.764 
                 1.640000 
                 60.19 
               
               
                 18 
                 −15.1784 
                 104.193 
               
               
                 19 
                 inf 
                 3.500 
                 1.516800 
                 63.8807 
               
               
                 20 
                 −25.7000 
                 105.853 
               
               
                 21 
                 245.4849 
                 28.161 
                 1.620410 
                 60.25 
               
               
                 22 
                 −191.188 
                 0.500 
               
               
                 23 
                 84.21076 
                 50.485 
                 1.620410 
                 60.25 
               
               
                 24 
                 −113.415 
                 5.000 
                 1.846660 
                 23.8 
               
               
                 25 
                 447.2304 
                 0.500 
               
               
                 26 
                 40.128 
                 27.364 
                 1.754998 
                 52.32 
               
               
                 26 
                 61.01281 
                 25.000 
               
               
                   
               
            
           
         
       
     
     Although not illustrated, at the objective lens  130  of Example 5, even in a case in which the optical module  136  for anterior eye portion observation is inserted on the optical path of the objective lens  130  that functions as an observing optical system for posterior eye portion observation, aberration with respect to lights of the wavelength region for anterior eye portion imaging (the visible light wavelength region or the near infrared region) is corrected well. 
     Fourth Embodiment 
     A fourth embodiment is described next. Because the structure of the fourth embodiment is substantially similar to the above-described embodiments, the same portions are denoted by the same reference numerals, and description thereof is omitted. 
     In the above-described embodiments, the objective lens  130 , which is included in the imaging optical system  116 A for observing the subject eye  12 , can suppress the dispersion in aberration with respect to lights of a wide wavelength region, which includes light of the visible light wavelength region and light of the near infrared region. Accordingly, the objective lens  130  relating to the above-described respective embodiments can be applied to ophthalmic devices that are exclusively used for SLO and OCT, respectively. In addition, in a combined device that has both functions of SLO and OCT, the objective lens  130  can be used as an objective lens shared by SLO and OCT (can be used for both). In the fourth embodiment, the objective lens  130  is used in common for SLO and OCT. 
     Because the wavelengths of the lights that are used are different in an optical system for SLO and an optical system for OCT, it is preferable to adjust the lens structures to as to accord with them respectively. Thus, in the fourth embodiment, because the objective lens  130  is used in common, the objective lens is structured by two lens groups, and the objective lens for SLO is made to be the reference, and the difference between the optical system for SLO and the optical system for OCT is absorbed by one lens group (e.g., the first lens group G 1 ). Specifically, by structuring the objective lens by two lens groups, and using the front lens group (the second lens group G 2 ) in common, and changing the structure of the rear lens group (the first lens group G 1 ), the system is structured so as to switch from functioning as a relay lens device for SLO to functioning as a relay lens device for OCT. 
       FIG. 16  illustrates an example of the structure of the objective lens  130  in the imaging optical system  116 A relating to the fourth embodiment. 
     As illustrated in  FIG. 16 , at the objective lens  130  relating to the fourth embodiment, a region that propagates substantially parallel light is formed on the optical path, and a splitting/combining element (e.g., a dichroic mirror) DM 1 , which splits and combines the optical path at the formed region, is provided. In the example illustrated in  FIG. 16 , an optical system is formed at a parallel system between the first lens group G 1  and the third lens group G 3 . In this case, the first lens group G 1  is a lens group such that the light, which heads from the first lens group G 1  toward the third lens group G 3 , becomes a parallel system. 
     Further, the third lens group G 3  is a lens group such that the light of the parallel system from the first lens group G 1  includes the intermediate pupil position P 3 . Specifically, the third lens group G 3  includes, in order from the scanning section side, a lens group G 31 , a lens group G 32  and a lens group G 33 . The lens group G 31  is a lens group having the function of forming an intermediate pupil at the interior of the third lens group G 3 , from the light of the parallel system from the first lens group G 1 . The lens group G 32  is a lens group having a concave surface at the intermediate pupil position P 3  or in a vicinity thereof. The lens group G 33  is a lens group having the function of transferring the intermediate pupil toward the second lens group. 
     For example, the optical path that includes the optical axis AX illustrated in  FIG. 16  is used as the SLO optical path, and the splitting/combining element DM 1  is disposed at a region between the first lens group G 1  and the third lens group G 3 , and is used at the OCT optical path. By doing so, the two optical systems of SLO and OCT can be combined. In this way, in the fourth embodiment, by forming a region, which propagates substantially parallel light, on the optical path of the objective lens  130 , and disposing the splitting/combining element DM 1 , which splits the optical path, at the formed region, the two optical paths of SLO and OCT can be combined. 
     The fourth embodiment describes a case of using an OCT optical path formed by a dichroic mirror or the like at a region that propagates substantially parallel light. However, the region that propagates substantially parallel light is not limited to a region between the first lens group G 1  and the third lens group G 3 . For example, a splitting/combining element may be provided in any space between the first lens group G 1  and the third lens group G 3  of the objective lenses  130  relating to the above-described respective embodiments. Further, although the fourth embodiment describes a case in which the splitting/combining element DM 1  is disposed at a region that propagates substantially parallel light, the fourth embodiment is not limited to this. For example, a splitting/combining element DM 2  may be disposed at a region between the lens group G 31  and the lens group G 32  at the third lens group G 3 , or a splitting/combining element DM 3  may be disposed at a region between the lens group G 32  and the lens group G 33 , or a splitting/combining element DM 4  may be disposed at a region between the third lens group G 3  and the second lens group G 2 . 
     In the structure illustrated in  FIG. 16 , of course, the optical path that includes the optical axis AX may be used as the OCT optical path, and the splitting/combining element DM 1  may be placed and used at the SLO optical path. 
     Note that, when an optical element (the splitting/combining element DM 4 ) is placed between the second lens group G 2  and the third lens group G 3 , there are cases in which flares arise in the visible light region. Therefore, in a case in which an optical element (the splitting/combining element DM 4 ) is placed between the second lens group G 2  and the third lens group G 3 , and the optical path is split, it is preferable to use a splitting optical path as the OCT optical path. 
     In this way, in accordance with the fourth embodiment, the objective lens  130  can be used also as a combined device that has the functions of both SLO and OCT. 
     Fifth Embodiment 
     A fifth embodiment is described next. Because the structure of the fifth embodiment is substantially similar to the fourth embodiment, the same portions are denoted by the same reference numerals, and description thereof is omitted. 
     There are cases in which an ophthalmic device has both a fixation target projecting optical system that provides a fixation target by a fixation lamp, and an subject eye position imaging optical system that captures an image of the position of the subject eye  12  by a camera or the like. At these observing optical systems such as the fixation target projecting optical system and the subject eye position imaging optical system or the like, the image forming performance is sufficient mainly by appropriately carrying out correction with respect to the visible region. On the other hand, at the objective lens  130  of the present disclosure, correction of aberration in a wide wavelength region that includes both the visible region for SLO and the near infrared region for OCT is extremely good. In this case, the system can be structured such that aberration correction in mainly the visible region is carried out at further toward the subject eye  12  side than the pupil conjugate position P 3  in the objective lens  130 , and aberration correction in the near infrared region is carried out by an optical system that is further toward the scanning system side than the pupil conjugate position P 3 . Namely, for the aberration correction, the wavelength region is divided into plural regions, and aberration correction for the different wavelength regions can be carried out respectively thereat. For example, the second lens group G 2  is used as the optical system that is further toward the subject eye  12  side than the intermediate pupil conjugate position P 3 , and the first lens group G 1  is used as the optical system that is further toward the scanning section side than the intermediate pupil conjugate position P 3 . Further, in a case of combining the optical paths of the observing optical systems such as the fixation target projecting optical system and the subject eye position imaging optical system and the like, a prism for optical path combining can be disposed within the third lens group G 3  at a region before or after the pupil conjugate position P 3  (the region where the splitting/combining element DM 2  or DM 3  illustrated in  FIG. 16  is disposed). In a case of giving more consideration to the effects of aberration in the visible region, it is preferable to place the prism for optical path combining, which combines the optical paths, at the region where the splitting/combining element DM 3  is disposed. Further, in a case of using infrared light in the subject eye position imaging optical system, it is effective to provide the prism for optical path combining at the position of DM 1  that is at the scanning section side in  FIG. 16 . In either case, in a case of providing a prism for optical path combining between the subject eye pupil P 2  and the pupil conjugate position P 1  at which the scanning section is disposed, it is important to adjust the balance of the aberration correcting functions at the respective groups of the objective lens that is structured to include three groups. 
     In this way, in accordance with the fifth embodiment, observing optical systems such as the fixation target projecting optical system and the subject eye position imaging optical system and the like can be provided at the ophthalmic device  110  by a simple structure. 
     Sixth Embodiment 
     A sixth embodiment is described next. Because the structure of the sixth embodiment is substantially similar to the above-described embodiments, the same portions are denoted by the same reference numerals, and description thereof is omitted. 
     In the above-described embodiments, the objective lens  130 , which is included in the imaging optical system  116 A for observing the subject eye  12 , can suppress dispersion in aberration with respect to lights of a wide wavelength region including light of the visible light wavelength region and light of the near infrared region. Accordingly, the objective lens  130  relating to the above-described respective embodiments can be applied an ophthalmic device that is exclusively used for SLO, and the ophthalmic device that is exclusively used for SLO can be switched from an ophthalmic device for SLO to use as an ophthalmic device for OCT. The sixth embodiment is structured such that an ophthalmic device that is exclusively used for SLO can be switched from an ophthalmic device for SLO to an ophthalmic device for OCT. 
       FIG. 17  illustrates an example of the structure of an ophthalmic device  110 A relating to the sixth embodiment. 
     As illustrated in  FIG. 17 , the ophthalmic device  110 A relating to the sixth embodiment has the relay lens device  140  that is exclusively used for SLO and that relays the scanning light of the SLO unit, and the objective lens  130  (refer to  FIG. 2  as well), and is formed as a device that is exclusively used for SLO. The relay lens device  140  is disposed at a relay unit  140 A that can be inserted into and removed from the ophthalmic device  110 A. Namely, the ophthalmic device  110 A functions as a device that is exclusively used for SLO, due to the relay unit  140 A being mounted to a relay lens mounting portion (not illustrated) of the ophthalmic device  110 A. 
     On the other hand, a relay unit  140 B can be mounted to the relay lens mounting portion (not illustrated) of the ophthalmic device  110 A. A dichroic mirror DM 5  that splits and combines light is disposed on the optical path of the relay lens device  140  at the relay unit  140 B. Further, an OCT unit is disposed at the relay unit  140 B on the optical path that has been split-off by the dichroic mirror DM 5 . Accordingly, by mounting the relay unit  140 B to the relay lens mounting portion (not illustrated) of the ophthalmic device  110 A, the ophthalmic device  110 A functions as a SLO device and can also function as an OCT device. 
     In this way, in accordance with the sixth embodiment, there is an ophthalmic device that can work as both a SLO device and an OCT device by replacing the relay lens device  140 , which a device that is exclusively used for SLO, with a relay lens  141  that has the same components as the relay lens device  140  and has the dichroic mirror DM 5  built therein, and by mounting the OCT unit. 
     Further, a great decrease in cost is possible by using the objective lens  130  in common, and using the lens structures of the relay lens device  140  and the relay lens  141  in common, and structuring the ophthalmic device in which both SLO and OCT are possible from a device that is exclusively used for SLO. 
     Note that, although the above describes a case in which the relay unit is mounted to the relay lens mounting portion (not illustrated), there may be a structure in which the relay lens device  140  is formed by plural lens groups, and the relay lens device  140  is fixed to the ophthalmic device  110 A, and the dichroic mirror DM 5  is inserted into and removed from the space between adjacent lens groups. In this case, the costs can be further decreased because switching of the relay lens device  140  is unnecessary. 
     In this way, because the technique of the present disclosure includes the function of structuring an ophthalmic device at which both SLO and OCT are possible from an ophthalmic device that functions as a device used exclusively for SLO, the technique of the present disclosure includes the following first technique. 
     (First Technique) 
     An ophthalmic device having: 
     a first optical path having a scanning section for angle-scanning a light bundle that is from a first light source; 
     an objective lens guiding the light bundle scanned by the scanning section to an subject eye; and 
     a relay lens disposed between the scanning section and the objective lens, and guiding the scanning light bundle that is from the scanning section to the objective lens, 
     wherein the relay lens has two lens groups, and includes an optical element for optical path combining/splitting that can be inserted and removed from between the two lens group, and a second optical path, which guides a light bundle, which is from a second light source different from the first light source, to the objective lens, is structured on a reflection optical path of the optical element for optical path combining/splitting in a state in which the optical element for optical path combining/splitting is disposed on the optical path. 
     Note that the dichroic mirror D 5  is an example of the optical element for optical path combining/splitting of the above-described first technique. 
     Further, because the optical system of the first technique includes an aberration correcting technique, following supplemental technique 1 and supplemental technique 2 are included. 
     (Supplemental Technique 1 of First Technique) 
     The ophthalmic device of the first technique, wherein, in a first combined optical system that includes the relay lens and the objective lens, first aberration correction is carried out on the light bundle from the first light source, and, at a second combined optical system that includes the objective lens and the lens group that is at the objective lens side among the two lens groups that structure the relay lens, second aberration correction that is different than the first aberration correction is carried out on the light bundle from the second light source. 
     (Supplemental Technique 2 of First Technique) 
     The ophthalmic device of the first technique, wherein the objective lens is a lens component that shared by the relay lens of the first optical path and the relay lens of the second optical path, and at which aberration correction is carried out on the light bundle from the first light source and the light bundle from the second light source. 
     Seventh Embodiment 
     A seventh embodiment is described next. Because the structure of the seventh embodiment is substantially similar to the above-described embodiments, the same portions are denoted by the same reference numerals, and description thereof is omitted. 
     In the technique of the present disclosure, the ophthalmic device includes at least one structure among respective optical systems that are an optical system for SLO that uses light mainly of a wavelength in the visible region, an optical system for OCT that uses light mainly of a wavelength in the near infrared region, and an alignment optical system that is used in alignment of the subject eye. Note that the alignment optical system includes a fixation target projecting optical system and an subject eye position imaging optical system. At these respective optical systems, there are cases in which the aberration correction with respect to the lens system is different at the SLO optical system and the OCT optical system. Thus, the seventh embodiment describes structural examples of ophthalmic devices that take aberration correction at the objective lens into consideration. 
     First Structural Example 
     An ophthalmic device that serves as a first structural example is an ophthalmic device for SLO that has an objective lens at which chromatic aberration correction in at least the visible region is carried out. An optical system, which includes an objective lens at which this chromatic aberration correction in the visible region is carried out, is described. 
       FIG. 18  illustrates an example of the structure of an imaging optical system  116 B in an ophthalmic device relating to the first structural example. 
     As illustrated in  FIG. 18 , the ophthalmic device relating to the first structural example functions as a device used exclusively for SLO. Specifically, the imaging optical system  116 B has, in order from the subject eye  12  side, an objective lens  1130  at which chromatic aberration correction in the visible region is carried out, the horizontal scanning section (also indicated as H scanner in  FIG. 18 )  142 , the relay lens device  140 , and the vertical scanning section (also indicated as V scanner in  FIG. 18 )  120  such as a polygon mirror or the like. 
     The horizontal scanning section  142  is an optical scanner that scans, in the horizontal direction, the SLO laser light that is incident via the relay lens device  140 . The vertical scanning section  120  is an optical scanner that scans, in the vertical direction, the laser light that is incident from the SLO unit  18 . In the present embodiment, a galvano mirror is used as an example of the horizontal scanning section  142 , and further, a polygon mirror is used as an example of the vertical scanning section  120 . 
     The relay lens device  140  has the two lens groups  144 ,  146  that have positive power. The relay lens device  140  is structured by the two lens groups  144 ,  146  such that the position of the vertical scanning section  120  and the position of the horizontal scanning section  142  are conjugate. More specifically, the relay lens device  140  is structured such that the central positions of the angular scanning of the both scanning sections are conjugate. Further, the relay lens device  140  is structured so as to include a position that is conjugate with the fundus of the subject eye  12 . Moreover, the relay lens device  140  is structured such that the position of the vertical scanning section  120  and the position of the horizontal scanning section  142  are conjugate with the pupil of the subject eye  12 . 
     The light that exits from the SLO unit  18  is two-dimensionally scanned by the vertical scanning section  120  and the horizontal scanning section  142  that structure the SLO optical system. The SLO laser light that is scanned two-dimensionally is made incident on the subject eye  12  via the objective lens  1130 . The SLO laser light that is reflected by the subject eye  12  goes through the objective lens  1130 , the horizontal scanning section  142 , the relay lens device  140  and the vertical scanning section  120 , and is made incident on the SLO unit  18 . 
     The objective lens  1130  has, in order from the horizontal scanning section  142  side, the first lens group G 1  and the second lens group G 2 . At least the second lens group G 2  is a positive lens group having positive power overall. In the present embodiment, the first lens group G 1  also is a positive lens group having positive power overall. Each of the first lens group G 1  and the second lens group G 2  has at least one positive lens. In a case in which each of the first lens group G 1  and the second lens group G 2  has plural lenses, the first lens group G 1  and the second lens group G 2  may include a negative lens, provided that each of the first lens group G 1  and the second lens group G 2  has positive power overall. The objective lens  1130  is structured to include a position that is conjugate with the fundus of the subject eye  12 . 
     Due to the above-described structure, an ophthalmic device that is exclusively used for SLO can be provided. 
     Second Structural Example 
     At the ophthalmic device that serves as a second structural example, chromatic aberration correction in at least the visible region for SLO is carried out at the objective lens. An optical system, which includes an objective lens at which this chromatic aberration correction in the visible region is carried out, is described. 
       FIG. 19  illustrates an example of the structure of an imaging optical system  116 C in the ophthalmic device relating to the second structural example. 
     As illustrated in  FIG. 19 , the ophthalmic device relating to the second structural example has functions of being able to work for both SLO and OCT. Further, the ophthalmic device relating to the second structural example includes an alignment optical system. Specifically, the optical system that functions as SLO is used as the reference, and the imaging optical system  116 C includes, in order from the subject eye  12  side, the objective lens  1130  at which chromatic aberration correction in the visible region is carried out, the horizontal scanning section (H scanner)  142 , the relay lens device  140  for SLO, and the vertical scanning section (V scanner)  120  such as a polygon mirror or the like. 
     As described above, because the wavelengths of the lights that are used are different in an optical system for SLO and an optical system for OCT, it is preferable to adjust the lens structures to as to accord with them respectively. In the second structural example, because the optical system for SLO and the optical system for OCT are used at the shared objective lens  1130 , the difference in aberration correction is absorbed at the relay lens device. Specifically, the relay lens device is structured by two lens groups, and the front lens group (e.g., the lens group  144  that is at the objective lens  1130  side of a relay lens device  1140  for SLO) is used in common, and, by making the structure of a lens group  1146  at the scanner  142  side be a structure that is different than a lens group  1146 A at the OCT side, the system is structured so as to switch from functioning as a relay lens device for SLO to functioning as a relay lens device for OCT. Further, the scanning section that scans OCT light also is different. Therefore, the second structural example has, between the objective lens  1130  and the horizontal scanning section (H scanner)  142 , the relay lens device  1140  that has a structure similar to the relay lens device  140  for SLO. The relay lens device  1140  has, in order from the subject eye  12  side, a front side lens group  1144  and the rear side lens group  1146 , and has, between the lens groups  1144 ,  1146 , a beam splitter  1148  that reflects the OCT light and the reflected light from the fundus. Specifically, the relay lens device  1140  has the lenses  1144 ,  1146  that have plural positive powers in the same way as the relay lens device  140 , and is structured to include a position that is conjugate with the fundus of the subject eye  12 . The lens group  1146 A, which corresponds to the lens group  1146  at the relay lens device  1140  for SLO and at which aberration correction for OCT is carried out, and a scanning section  1142  for OCT are disposed in that order at the opposite side of the beam splitter  1148 , i.e., the side opposite the reflected light from the fundus. Namely, this is a structure in which, in OCT, XY scanning is executed independently from SLO. Further, the scanning section  1142  for OCT is disposed at a position that is conjugate with the pupil of the subject eye  12 . 
     Further, in order for the imaging optical system  116 C to include an alignment optical system, the imaging optical system  116 C has, between the objective lens  1130  and the relay lens device  1140 , the beam splitter  178  that guides the optical path with respect to an alignment optical system  138 H. Namely, at the imaging optical system  116 C, the beam splitter  178  is inserted on the optical path of the optical system that functions as SLO, and the alignment optical system, which includes a fixation target projecting optical system  138 HA, an subject eye position imaging optical system  138 HB and an illuminating device  138 HC, is provided at the opposite side of the beam splitter  178 . Further, the beam splitter  178  is disposed at a position that is conjugate with the pupil of the subject eye  12 . 
     Due to the above-described structure, the objective lens  1130  for SLO can also be used for OCT. 
     Third Structural Example 
     An ophthalmic device that serves as a third structural example is an ophthalmic device used exclusively for OCT that uses, as the objective lens for OCT, an objective lens at which chromatic aberration correction in at least the visible region is carried out for SLO. 
       FIG. 20  illustrates an example of the structure of an imaging optical system  116 D in the ophthalmic device relating to the third structural example. 
     As illustrated in  FIG. 20 , the ophthalmic device relating to the third structural example functions as a device exclusively used for OCT. Specifically, the imaging optical system  116 D has, in order from the subject eye  12  side, the objective lens  1130  at which chromatic aberration correction in the visible region is carried out, the relay lens device  1140  that includes the beam splitter  1148 , the lens group  1146 A at which aberration correction is carried out for OCT and that is at the opposite side of the beam splitter  1148 , and the scanning section  1142  for OCT. The imaging optical system  116 D has fundus camera optical system Fundus at the transmission side of the relay lens device  1140 . The fundus camera optical system Fundus is disposed at a position that is conjugate with the pupil of the subject eye  12 . 
     Due to the above-described structure, an ophthalmic device that is used exclusively for OCT can be provided by using the objective lens  1130  for SLO. 
     Fourth Structural Example 
     An ophthalmic device that serves as a fourth structural example is an ophthalmic device for SLO that has the objective lens  130  relating to the first embodiment, i.e., the objective lens  130  at which chromatic aberration correction in the visible region and the near infrared region is carried out. 
       FIG. 21  illustrates an example of the structure of an imaging optical system  116 E in the ophthalmic device relating to the fourth structural example. 
     As illustrated in  FIG. 21 , the ophthalmic device relating to the fourth structural example functions as a device exclusively used for SLO. Specifically, the imaging optical system  116 E has, in order from the subject eye  12  side, the objective lens  130  relating to the first embodiment, i.e., the objective lens  130  at which chromatic aberration correction in the visible region and the near infrared region is carried out, the horizontal scanning section  142 , the relay lens device  140  and the vertical scanning section  120 . 
     As explained in  FIG. 3 , the objective lens  130  has, in order from the horizontal scanning section  142  side, the first lens group G 1  and the second lens group G 2 , and has the third lens group G 3  between the first lens group G 1  and the second lens group G 2 . The objective lens  130  is structured so as to include a position that is conjugate with the pupil of the subject eye  12  within the third lens group G 3 , and further, is structured so as to include a position that is conjugate with the fundus of the subject eye. Note that, in  FIG. 21 , the three lens groups within the objective lens  130  are illustrated simply as G 1 , G 2 , G 3 . These correspond to the three lens groups  134 ,  132 ,  133  illustrated in  FIG. 3 . The same holds in the drawings hereinafter. 
     In this way, by using the objective lens  130  that incorporates an intermediate pupil therein, chromatic aberration correction in the visible region and the near infrared region is carried out, and the maximum aperture of the objective lens  130  is reduced, and an increase in the weight of the objective lens  130  is suppressed. Due thereto, there can be provided an ophthalmic device used exclusively for SLO in which the weight of the device overall can be lightened. 
     Fifth Structural Example 
     An ophthalmic device that serves as a fifth structural example is an ophthalmic device having SLO and OCT, and having the objective lens  130  at which chromatic aberration correction in the visible region and the near infrared region is carried out. 
       FIG. 22  illustrates an example of the structure of an imaging optical system  116 F in the ophthalmic device relating to the fifth structural example. As illustrated in  FIG. 22 , the ophthalmic device relating to the fifth structural example has functions of being able to work for both SLO and OCT. In the fifth structural example that is illustrated in  FIG. 22 , the point that the objective lens  1130  of the second structural example illustrated in  FIG. 19  is replaced with the objective lens  130 , at which chromatic aberration correction in the visible region and the near infrared region is carried out, is different. 
     Due to the above-described structure, an objective lens for SLO and an objective lens for OCT can be used in common. 
     Sixth Structural Example 
     An ophthalmic device that serves as a sixth structural example is an ophthalmic device used exclusively for OCT that uses, as the objective lens for OCT, the objective lens  130  at which chromatic aberration correction in the visible region and the near infrared region is carried out. 
       FIG. 23  illustrates an example of the structure of an imaging optical system  116 G in the ophthalmic device relating to the sixth structural example. 
     As illustrated in  FIG. 23 , the ophthalmic device relating to the sixth structural example functions as a device used exclusively for OCT. In the sixth structural example illustrated in  FIG. 23 , the point that the objective lens  1130  of the third structural example illustrated in  FIG. 20  is replaced with the objective lens  130  at which chromatic aberration correction in the visible region and the near infrared region is carried out, differs. In this structure, as explained in  FIG. 3 , at the objective lens  130 , aberration correction for both the SLO optical system and the OCT optical system is carried out by the aberration correcting ability of the third lens group  133  (G 3 ) that serves as an intermediate group, and therefore, the structures of the relay lenses can be made to be exactly the same structures. 
     Due to the above-described structure, an ophthalmic device, which is exclusively used for OCT and in which chromatic aberration correction is carried out from the visible region to the near infrared region, can be provided. 
     Seventh Structural Example 
     An ophthalmic device that serves as a seventh structural example is an ophthalmic device that functions as both SLO and OCT, and uses the objective lens  130  at which chromatic aberration correction in the visible region and the near infrared region is carried out. 
       FIG. 24  illustrates an example of the structure of an imaging optical system  116 H in the ophthalmic device relating to the seventh structural example. 
     As illustrated in  FIG. 24 , the ophthalmic device relating to the seventh structural example functions as a SLO device and an OCT device. Specifically, the imaging optical system  116 H has, in order from the subject eye  12  side, the objective lens  130  at which chromatic aberration correction from the visible region to the near infrared region is carried out and that includes the first lens group G 1  through the third lens group G 3 , and has the horizontal scanning section  142 , the relay lens device  140  and the vertical scanning section  120 , and structures an optical system for SLO. 
     In order to absorb the difference in aberration correction that is due to the difference in the scanning lights of SLO and OCT, in the seventh structural example, the optical system for SLO is used as the reference, and the system is structured so as to also accord with an optical system for OCT by adjusting the structure of the first lens group G 1  of the objective lens  130  (refer to  FIG. 16  as well). Namely, the system is structured so as to propagate substantially parallel light between the first lens group G 1  and the third lens group G 3 , and the splitting/combining element (e.g., a dichroic mirror) DM 1  is disposed on the optical path thereof. A lens group  134 A, which corresponds to the first lens group G 1  of the objective lens that functions as SLO and at which aberration correction is carried out for OCT, and a scanning section  1142 A for OCT, are disposed in that order at the opposite side of the splitting/combining element DM 1 . Namely, this is a structure in which, in OCT, XY scanning is executed independently of SLO. Further, the scanning section  1142 A for OCT is disposed at a position that is conjugate with the pupil of the subject eye  12 . By structuring the system in this way, the two optical systems for SLO and OCT can be combined, while taking the aberrations of the individual optical systems into consideration. 
     Further, the ophthalmic device of the seventh structural example has the alignment optical system  138 H. Specifically, a prism for optical path combining is disposed at either one of the front and rear regions of the pupil conjugate position P 3  that is within the third lens group G 3 . In the example illustrated in  FIG. 24 , a case is illustrated in which the prism for optical path combining is disposed in front of the pupil conjugate position (the region where the splitting/combining element DM 1  illustrated in  FIG. 16  is disposed). By structuring the system in this way, at least one optical system among the fixation target projecting optical system  138 HA and the subject eye position imaging optical system  138 HB can be placed appropriately. 
     Due to the above-described structure, an ophthalmic device that functions respectively as SLO and OCT at which aberration correction is carried out appropriately can be provided, and an ophthalmic device having the alignment optical system  138 H can be provided. 
     In this way, because the technique relating to the seventh embodiment includes the providing of an ophthalmic device including at least one of SLO, OCT and alignment optical systems, this technique includes the following second technique. 
     (Second Technique) 
     An ophthalmic device having: 
     a first scanning section for scanning a light bundle that is from a first light source; 
     an afocal objective lens system that guides the light bundle scanned by the first scanning section to an subject eye; 
     a first optical path disposed between the first scanning section and the objective lens, and having a first afocal relay system that guides the light bundle scanned from the first scanning section to the objective lens; 
     a second scanning section for scanning a light bundle that is from a second light source that is different than the first light source; and 
     a second optical path having a second afocal relay system for passing the light bundle, which was scanned by the second scanning section, through the afocal objective lens system and guiding the light bundle to the subject eye, 
     wherein the first afocal relay system and the second afocal relay system have a shared beam splitter, and the first optical path and the second optical path are combined by the shared beam splitter. 
     Further, the technique of the present disclosure includes the following third technique. 
     (Third Technique) 
     The ophthalmic device of the second technique, wherein 
     the first afocal relay system and the second afocal relay system have two positive lens groups respectively, and the shared beam splitter is disposed between the two positive lens groups, and 
     the positive lens group, which is at the shared afocal objective lens system side of the first afocal relay system, is structured so as to be used in common as the positive lens group that is at the shared afocal objective lens system side of the second afocal relay system. 
     By the way, as described above, cases of using an objective lens in common for SLO and OCT respectively, and cases in which aberration correction is carried out for only either one light source of SLO and OCT and it is considered that the aberration correction of the other is insufficient, are included. Therefore, the technique of the present disclosure includes the following fourth technique. 
     (Fourth Technique) 
     The ophthalmic device of the second technique, wherein 
     the positive lens group at the first scanner side of the first afocal relay system is different than the positive lens group at the second scanner side of the second afocal relay system, 
     at the first optical path, at a combined system of the first afocal relay system and the shared objective lens system, aberration correction is carried out on the light bundle from the first light source, 
     at the second optical path, at a combined system of the second afocal relay system and the shared objective lens system, aberration correction is carried out on the light bundle from the second light source. 
     Further, because the technique of the present disclosure includes a case in which aberration correction is complete at the shared objective lens system, the following fifth technique is included. 
     (Fifth Technique) 
     The ophthalmic device of the second technique, wherein 
     at the shared objective lens system, aberration correction is carried out on the light bundle from the first light source and on the light bundle from the second light source, 
     the positive lens group at the first scanner side of the first afocal relay system is the same as the positive lens group at the second scanner side of the second afocal relay system, 
     at the first optical path, at a combined system of the first afocal relay system and the shared objective lens system, aberration correction is carried out on the light bundle from the first light source, and 
     at the second optical path, in combining the second afocal relay system and the shared objective lens system, aberration correction is carried out on the light bundle from the second light source. 
     Further, because the technique of the present disclosure includes a case in which the shared objective lens system is an objective lens in which a pupil is incorporated, the following sixth technique is included. 
     (Sixth Technique) 
     The ophthalmic device of the second technique, wherein the shared objective lens system has: 
     a positive first lens group G 1  at the scanner side; 
     a positive second lens group G 2  at the subject eye side; and 
     a third lens group G 3  that is disposed between the both groups and includes a diverging surface. 
     Further, the technique of the present disclosure includes the following seventh technique. 
     (Seventh Technique) 
     The ophthalmic device of the second technique, wherein, at the shared objective lens system, a conjugate position (intermediate pupil position) that is conjugate with the scanning center of the scanner is formed between the first lens group G 1  and the second lens group G 2 , and the third lens group G 3  includes this intermediate pupil position. 
     Further, the technique of the present disclosure includes the following eighth technique. 
     (Eighth Technique) 
     An ophthalmic device having: 
     a first scanner for scanning a light bundle that is from a first light source; 
     an afocal objective lens system that guides the light bundle scanned by the first scanning section to an subject eye; 
     a first optical system disposed between the first scanning section and the afocal objective lens, and having a first afocal relay system that guides the light bundle scanned from the first scanning section to the afocal objective lens; 
     a second scanning section for scanning a light bundle that is from a second light source that is different than the first light source; and 
     a second optical system having a second afocal relay system for passing the light bundle, which was scanned by the second scanning section, through the afocal objective lens system and guiding the light bundle to the subject eye, 
     wherein the second afocal relay system has a beam splitter, and is structured so as to be able to be switched with the first afocal relay system, and, by switching the first afocal relay system to the second afocal relay system, the first optical system and the second optical system are combined via the beam splitter, and subject eye observation by the first light source and subject eye observation by the second light source become possible. 
     Further, the technique of the present disclosure includes the following ninth technique. 
     (Ninth Technique) 
     The ophthalmic device of the eighth technique, wherein, at the shared objective lens system, aberration correction is carried out on the light bundle from the first light source and the light bundle from the second light source, and the first afocal relay system and the second afocal relay system are the same. 
     Further, the technique of the present disclosure includes the following tenth technique. 
     (Tenth Technique) 
     The ophthalmic device of the eighth technique, wherein the shared objective lens system has: 
     a positive first lens group G 1  at the scanner side; 
     a positive second lens group G 2  at the subject eye side; and 
     a third lens group G 3  that is disposed between the both groups and includes a diverging surface. 
     Although the technique of the present disclosure has been described by using embodiments, the technical scope of the present disclosure is not limited to the scope put forth in the above-described embodiments. Various modifications and improvements can be added to the above-described embodiments within a scope that does not depart from the gist of the invention, and forms to which such modifications and improvements have been added also are included in the technical scope of the present disclosure. Further, all publications, patent applications, and technical standards mentioned in the present specification are incorporated by reference into the present specification to the same extent as if such individual publication, patent application, or technical standard was specifically and individually indicated to be incorporated by reference. 
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