Patent ID: 12256991

DETAILED DESCRIPTION

With respect to the use of plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.

First Embodiment

Hereinafter, an ophthalmologic apparatus10as an embodiment of this disclosure will be described with reference to the drawings.FIG.1is a side view illustrating an external appearance of the ophthalmologic apparatus10according to this embodiment. Herein, X-axis, Y-axis, and Z-axis are set as illustrated inFIG.1. As viewed from a subject P's perspective, a direction from side to side is defined as “X direction” (positive direction of X-axis is rightward direction, negative direction of X-axis is leftward direction), a direction from the upper side to the lower side (vertical direction) is defined as “Y direction” (positive direction of Y-axis is upward direction, negative direction of Y-axis is downward direction), and a direction from the front to the back (depth direction of the device body20, where the side closer to the subject P is the front and the opposite side is the back (rear)) is defined as “Z direction” (positive direction of Z-axis is frontward direction, negative direction of Z-axis is rearward direction). In addition, the front side of the ophthalmologic apparatus10(the side closer to the subject P) is defined as the front, and the back side (the side closer to an examiner) is defined as the rear.

The ophthalmologic apparatus10of this embodiment is a fundus imaging device for observing the fundus of a subject's eye E and capturing images of the fundus. Note that the ophthalmologic apparatus of this disclosure is not limited to a fundus imaging device and may be, for example, an ophthalmologic apparatus that enables one or both of subjective examination and objective examination (to be described), an optical coherence tomography (OCT) device, an axis length measuring device, or a tonometer.

As illustrated inFIG.1, the ophthalmologic apparatus10of this embodiment includes a device body20and a casing (body cover)30that covers the device body20. The device body20includes a base11, a drive unit12, a mount13, a measurement head14as an eye information acquisition unit, a chin rest15, a head rest16, an operation unit17, a monitor18, and a control unit (control device)19. The base11, the drive unit12, the mount13, the measurement head14, and the control unit19of the device body20are covered by the casing30. The chin rest15, the head rest16, and the operation unit17project outward from the casing30.

In the ophthalmologic apparatus10of this embodiment, the mount13is disposed in the base11with the drive unit12involved, and the drive unit12enables the mount13to move back and forth and from side to side (in Z direction and X direction) relative to the base11. The mount13is provided with the control unit19and the measurement head14. The measurement head14is moved up and down (in Y direction) relative to the mount13by the drive unit12.

In this embodiment, the base11is also covered by the casing30, but the present invention is not limited to the configuration. The casing30may be fixed to the base11to cover the mount13, the measurement head14, the drive unit12, the control unit19, and the like on the base11.

The base11is provided with the chin rest15and the head rest16used for fixing the position of the subject P's face, or the subject's eye E, relative to the measurement head14when acquiring eye information. The chin rest15and the head rest16are moved up and down relative to the base11by a known drive unit (or manually). The ophthalmologic apparatus10acquires information associated with, for example, observation, imaging, and examination of the subject's eye E while the subject P opposes the measurement head14, resting his/her head on the head rest16and his/her chin on the chin rest15.

The operation unit17is operated when an examiner or the subject P gives the ophthalmologic apparatus10instructions such as actions and settings of the chin rest15, the measurement head14, and the drive unit12. The operation unit17of this embodiment includes a tiltable control lever17adisposed on the mount13. The examiner operates the control lever17ato move the measurement head14three-dimensionally relative to the base11. Furthermore, the control lever17ais provided with a button switch17bat the top. The examiner presses the button switch17bto start optometry by the measurement head14.

The operation unit17also includes software keys such as control buttons shown on the screen18aof the monitor18. Operating the control buttons enables various actions such as alignment relative to the subject's eye E, setting of various examination conditions, and adjustment of the screen18a. Note that the operation unit17may include input devices such as various buttons, a keyboard, and a mouse disposed around the control lever17aand around the monitor18.

The monitor18is attached to the top of the casing30. The monitor18is, for example, a liquid crystal display (LCD monitor) and includes the screen18aof touch panel type. Under control of the control unit19, the monitor18appropriately shows, for example, images of the subject's eye E (such as anterior segment images, fundus images, and OCT images) based on image data from the measurement head14, various kinds of examination information (such as examiner information, examination conditions, examination results, and measurement images) from the measurement head14, and an image of the control buttons functioning as the operation unit17. The monitor18of this embodiment is rotatably supported by the casing30via a rotary support mechanism18b, and the orientation of the screen18acan be changed appropriately. For example, the screen18acan be oriented to the subject, or the screen18acan be turned sideways (in X direction).

The control unit19collectively controls each unit in the ophthalmologic apparatus10. The control unit19includes a CPU and a storage unit such as RAM, ROM, EEPROM, and hard disk drive. To the control unit19, for example, the drive unit12, the chin rest15, the operation unit17, the monitor18, the measurement head14, and the storage unit are connected. The control unit19unfolds a computer program stored in the storage unit in advance on, for example, RAM, thereby collectively controlling actions of the ophthalmologic apparatus10(drive unit12, chin rest15, monitor18, measurement head14) according to the operation of the operation unit17.

The measurement head (eye information acquisition unit)14acquires eye information of the subject's eye E. Examples of the eye information include not only anterior segment images of the subject's eye E, fundus images of the subject's eye E, and tomographic images of the retina of the subject's eye E but also corneal endothelial images of the subject's eye E and characteristics of the subject's eye E such as refractive power, corneal shape, and intraocular pressure.

The measurement head14includes an objective optical system unit21that opposes the subject's eye E and a measurement optical system22that includes optical elements such as relay lens, imaging element, eyepiece, and light source. The objective optical system unit21includes an objective optical system21aincluding at least one objective lens and a lens barrel21bhousing the objective optical system21a. As illustrated inFIG.1, the objective optical system unit21projects outward from an opening31disposed in a casing body in the front of the casing30(the side closer to the subject's eye E), which enables the objective optical system21ato oppose the subject's eye E.

At least one of subjective examination and objective measurement is performed with the measurement head14. The subjective examination is an approach to acquiring information of the subject's eye E using a response from the subject P. Examples of the subjective examination include perimetry and subjective refractometry such as distance vision test, near vision test, contrast sensitivity test, and glare test. The objective measurement is an approach to acquiring information of the subject's eye E mainly using a physical method without referring to a response from the subject P. The objective measurement includes acquiring characteristics of the subject's eye E and capturing images of the subject's eye E. Examples of the objective measurement include objective refractometry, corneal topography, tonometry, fundus imaging, and optical interferometry. Since the ophthalmologic apparatus10of this embodiment is an ophthalmic imaging device, the measurement head14mainly captures fundus images.

The objective optical system unit21is disposed in the opening31of the casing30, being capable of moving up and down, from side to side, and back and forth. For this reason, the opening31has a size that does not prevent the objective optical system unit21from moving up and down and from side to side. In other words, a dimension of the opening31in the upward-downward direction corresponds to a length obtained by adding outside diameters of the objective optical system unit21and a second cover portion42(to be described later) that houses the objective optical system unit21and a moving distance in the upward-downward direction, and a dimension of the opening31in the rightward-leftward direction corresponds to a length obtained by adding the above outside diameters and a moving distance in the rightward-leftward direction.

In the related art, the subject P visually recognizes the measurement head14inside the casing30through the opening31with no cover40and sees how the measurement head14moves up and down, from side to side, and back and forth. Particularly, the forward movement of the measurement head14possibly gives the subject P a sense of fear that the measurement head14is approaching. For this reason, the subject P may not be able to concentrate on the examination and may glance away from a target or separate his/her face from the chin rest15or the head rest16, which affects the acquisition of the eye information. In addition, someone may put a finger in the opening31by mistake, or dirt, dust, and foreign matters may enter the opening31. The opening31may be covered with a curtain or the like. However, the curtain may be opened along with the movement of the objective optical system unit21, and it is difficult to appropriately hide the inside of the casing30.

In order to solve these problems, in the ophthalmologic apparatus10of this embodiment, the cover40is attached to the opening31to close the opening31as illustrated inFIGS.1and2A to2Cso that the subject P does not visually recognize the inside of the casing30.

Details of the cover40will be described with reference toFIGS.2A to2C.FIG.2Ais a front view of the cover40and the vicinity of an engagement holder32of the casing30, andFIG.2Bis a side view (cross-sectional view) thereof.FIG.2Cis a side view (cross-sectional view) of the cover40moved to a position different from that inFIG.2B.

As illustrated inFIGS.2A and2B, the cover40includes a first cover portion41disposed in the opening31and a second cover portion42attached to an outer periphery of the objective optical system unit21. The first cover portion41disposed in the opening31is capable of moving up and down and from side to side (rightward and leftward), but not back and forth forward-rearward) relative to the casing30. The second cover portion42is inserted into the first cover portion41, and is capable of moving back and forth (forward-rearward) relative to the first cover portion41. In other words, the first cover portion41and the second cover portion42have a nested structure (telescopic structure).

The first cover portion41has a protruding shape in side view, including a disk-shaped base plate43disposed in the opening31and a cylindrical guide44projecting from the base plate43toward the subject's eye E (the front).

The base plate43functions as a cover of the opening31and as an engagement portion with respect to the opening31. In other words, the base plate43engages with the engagement holder32disposed along the opening31in an inner surface of the casing30. The engagement holder32has a ring shape in plan view and has a U-shape in cross-sectional view, including a pair of holding walls33for holding the base plate43and a housing space34partitioned by the pair of holding walls33to house the base plate43. A distance between inner surfaces of the pair of holding walls33(width of the housing space34) is substantially equal to a thickness of the base plate43(length in the forward-rearward direction).

Accordingly, the base plate43can freely move up and down and from side to side (that is, in X-Y plane) within the housing space34while touching the inner surfaces of the pair of holding walls33and closing the opening31. Simultaneously, the movement of the base plate43in the forward-rearward direction is suppressed (blocked). Furthermore, when the first cover portion41moves in X-Y plane, an outer peripheral edge of the base plate43abuts a bottom face35of the housing space34or an outer periphery of the guide44abuts a peripheral edge of the opening31, thereby suppressing further movement. Therefore, the engagement holder32functions as a movement controller that allows the first cover portion41to move up and down and from side to side by a predetermined distance but suppresses the movement of the first cover portion41in the forward-rearward direction and functions as a retainer that prevents the cover40from coming off the opening31. In addition, closing the opening31by the base plate43appropriately prevents penetration of dirt and the like into the casing30from the opening31and prevents insertion of a finger.

The guide44of the first cover portion41has a cylindrical shape with both ends opened, including an inward flange44aprojecting toward the center from a peripheral edge of one (front) end opposing the subject's eye E. An inner peripheral edge of the inward flange44ais an insertion hole44bthrough which the second cover portion42is inserted.

In this embodiment, the engagement holder32, a separate member from the casing30, is fixed to the inner surface of the casing30, but the present invention is not limited to this configuration. For example, an L-shaped member in cross-sectional view may be fixed to the inner surface of the casing30, and a wall of this member and a wall of the casing30may form an engagement holder. Alternatively, the casing30may have a thick wall, and the wall may be hollowed out along an inner periphery of the opening31to form a housing space, thereby forming an engagement holder.

The second cover portion42is a tubular member with both ends opened (cylindrical member in this embodiment), including a housing space45for housing the objective optical system unit21. In other words, the second cover portion42is attached to the outer periphery of the objective optical system unit21, being capable of moving up and down, from side to side, and back and forth together with the measurement head14including the objective optical system unit21. The second cover portion42is inserted into the insertion hole44bof the guide44of the first cover portion41, being capable of moving back and forth. An inside diameter of the insertion hole44band an outside diameter of the second cover portion42are substantially equal. While the second cover portion42closes the insertion hole44b, the second cover portion42touches an inner surface of the insertion hole44band moves back and forth. However, the movement of the second cover portion42relative to the first cover portion41is suppressed in the upward-downward direction and the rightward-leftward direction.

Therefore, when the measurement head14moves back and forth, the second cover portion42moves back and forth within the guide44of the first cover portion41independently from the first cover portion41. When the measurement head14moves up and down and from side to side, the second cover portion42moves up and down and from side to side together with the first cover portion41. In addition, dirt and the like are prevented from penetrating into the casing30from the insertion hole44b.

Furthermore, the second cover portion42is provided with an outward flange46projecting radially outward from a peripheral edge of the rear end. The outward flange46has a dimension large enough to touch a guide surface44cof the guide44of the first cover portion41. When the second cover portion42moves back and forth, the outward flange46moves along the guide surface44cwhile touching the guide surface44c. The guide44appropriately guides the movement of the second cover portion42in the forward-rearward direction, suppresses rattles, vibrations, and the like during the movement, and supports smooth movement of the second cover portion42.

When the second cover portion42moves forward, the outward flange46abuts the inward flange44aof the guide44to suppress further movement. Therefore, the outward flange46and the inward flange44adouble as a movement controller and as a retainer of the second cover portion42.

A moving distance of the second cover portion42in the forward-rearward direction substantially accords with a moving distance of the measurement head14in the forward-rearward direction (operating distance for alignment). When the measurement head14moves forward to the maximum extent together with the second cover portion42, it is desirable that the outward flange46abuts the inward flange44aor is arranged at a position leaving a predetermined margin without abutting the inward flange44a. On the other hand, when the measurement head14moves backward to the maximum extent together with the second cover portion42as illustrated inFIG.2C, it is preferable that one (front) end surface of the first cover portion41(more specifically, the guide44) and one (front) end surface of the second cover portion42are flush with each other. In this manner, adjusting the dimension of each member prevents the second cover portion42from coming off the first cover portion41or coming off the objective optical system unit21and prevents influences on the movement of the measurement head14.

The first cover portion41and the second cover portion42are not particularly limited in material and may employ a metallic material, a resin material, or the like. However, a resin material is desirable from viewpoints of, for example, cost reduction, enhancement of adhesion between the members, and reduction of noise and abrasion caused by a rub between the members. Examples of the resin material include, but are not limited to, polycarbonate resin, ABS resin, polyacetal resin, and nylon resin.

The first cover portion41, the second cover portion42, and even the engagement holder32preferably employ, for example, an elastic resin material such as polyurethane resin or polyester resin. Such a resin material enhances the adhesion of a sliding portion, or a contacting portion, between the engagement holder32and the first cover portion41and a sliding portion between the first cover portion41and the second cover portion42, which further prevents formation of a gap that allows penetration of dust and the like. Even when one of two contacting parts includes an elastic resin material and the other includes a relatively hard resin material, the contacting parts can move smoothly while adhering to each other not to form a gap.

It is also preferable to provide a friction reducer that reduces frictional resistance on the sliding portion (contacting surface) between the engagement holder32and the first cover portion41and the sliding portion (contacting surface) between the first cover portion41and the second cover portion42. Examples of the friction reducer include fluororesin applied to the surface of each sliding portion (contacting surface) and a fluororesin-processed sheet spread on the surface of each sliding portion. It is also preferable to dispose a slide bearing on each sliding portion (contacting surface). Accordingly, it is possible to reduce friction of the sliding portions, which appropriately prevents noise and abrasion, and what is more, it is possible to move the first cover portion41and the second cover portion42more smoothly without causing rattles and vibrations.

Moving distances of the first cover portion41in the upward-downward direction and the rightward-leftward direction substantially accords with moving distances of the measurement head14in the upward-downward direction and the rightward-leftward direction. The measurement head14moves up and down depending on a distance between the base11and the chin rest15in the upward-downward direction and a distance between the chin rest15and the subject's eye E in the upward-downward direction. In the ophthalmologic apparatus10that acquires eye information of one subject's eye E on the right or left and then acquires eye information of the other, the measurement head14moves from the position of one subject's eye E to the position of the other in the rightward-leftward direction. In other words, since the measurement head14moves within at least an interpupillary distance PD between right and left subject's eyes E, the first cover portion41also moves together with the second cover portion42within a moving distance corresponding to the interpupillary distance PD.

In view of the above configuration, the opening31is opened not to hinder the movement of the first cover portion41within the moving distances in the upward-downward direction and the rightward-leftward direction. The base plate43of the first cover portion41has a size (surface area) large enough to close the opening31constantly even when the base plate43moves up and down and from side to side within the moving distances.

The procedure for assembling the cover40and the casing30having the aforementioned configuration will be described with reference toFIG.3.FIG.3is a plan view of the cover40and the casing30as viewed from the upper side, describing the procedure for assembling the cover40and the casing30. As illustrated inFIG.3, the casing30includes two right and left parts (casings30aand30b), and the engagement holder32is also divided into two right and left parts (engagement holders32aand32b) and fixed to inner surfaces of the casings30aand30b. The two casings30aand30bare disposed around the device body20from both sides and are connected to each other by a fitting structure such as a recess and a protrusion or by a fixing member such as a screw, thereby covering the device body20. Note that the casing30is not limited to this configuration and may have any configuration as long as the casing30holds the first cover portion41.

First, as illustrated inFIG.3, in the device body20having the drive unit12, the mount13, the measurement head14, the control unit19, and the like assembled on the base11, the second cover portion42is attached to the outer periphery of the objective optical system unit21of the measurement head14. Next, the first cover portion41is moved from the front to the rear of the second cover portion42, and the first cover portion41is disposed in the outer periphery of the second cover portion42. At this time, the second cover portion42is inserted into the guide44of the first cover portion41, and one end of the second cover portion42projects from the insertion hole44b.

Next, the two casings30aand30bare attached to the device body20from both sides, and the base plate43of the first cover portion41is engaged with the engagement holders32aand32b. The two casings30aand30bare coupled to each other, thereby completing the attachment of the cover40to the casing30. Since the casing30and the cover40are assembled with such a structure, the first cover portion41is held by the casing30while being fixed to the casing30, which appropriately prevents the first cover portion41from moving back and forth and from falling off the casing30. In addition, the functions of the inward flange44aand the outward flange46prevent the second cover portion42from falling off the first cover portion41.

The process for disassembling these components is opposite to the assembly. First, the casings30aand30bare uncoupled and detached from the device body20. Next, the first cover portion41is moved forward and detached from the second cover portion42, and then, the second cover portion42is moved forward and pulled out from the tip of the objective optical system unit21. In this manner, the cover40and the casing30are assembled and disassembled easily.

Hereinafter described are functions and effects of the cover40when acquiring eye information with the ophthalmologic apparatus10having the aforementioned configuration. First, a subject P puts his/her head on the head rest16and his/her chin on the chin rest15to oppose the ophthalmologic apparatus10. Next, an examiner operates the operation unit17to select a subject's eye E from which eye information is to be acquired and gives an alignment instruction. The control unit19receives instruction signals and drives the drive unit12to move the measurement head14up and down and from side to side, thereby aligning the measurement head14in the upward-downward direction and the rightward-leftward direction. At this time, following the movement of the measurement head14, the objective optical system unit21and the second cover portion42and the first cover portion41housing the objective optical system unit21move up and down and from side to side within the opening31of the casing30. Accordingly, the opening31is constantly covered with the first cover portion41, and the subject P does not visually recognize the movement of the measurement head14inside the casing30.

Furthermore, the control unit19moves the measurement head14back and forth to align in the forward-rearward direction. The objective optical system unit21and the second cover portion42move back and forth inside the first cover portion41, following the movement of the measurement head14, but the first cover portion41engaged with the engagement holder32of the casing30does not move back and forth and keeps covering the opening31. Accordingly, the subject P does not visually recognize the movement of the measurement head14in the forward-rearward direction. This makes it possible for the subject P to concentrate on the acquisition of the eye information without feeling a sense of fear that the measurement head14is approaching the subject's eye E.

On completion of the alignment, the control unit19receives a measurement instruction from the examiner through the operation unit17or automatically controls the measurement head14so as to acquire the eye information of the subject's eye E. Since the subject P can concentrate on the acquisition of the eye information, it is possible to acquire the eye information appropriately and efficiently. In addition, the cover40attached to the opening31appropriately prevents dirt, dust, and foreign matters from penetrating into the opening31and prevents a finger or the like from entering the opening31by mistake.

Accordingly, it is possible to provide the ophthalmologic apparatus10and the cover40that appropriately hide the movement of the measurement head14as the eye information acquisition unit and appropriately acquire information of a subject's eye. Furthermore, the cover40having such excellent effects is formed by a simple configuration including the first cover portion41and the second cover portion42. Accordingly, it is possible to provide the cover40that is easy to assemble and disassemble.

Modification

Next, covers40A to40C of first to third modifications will be described with reference toFIGS.4A to6B.FIGS.4A,5A, and6Aare front views of the vicinity of the covers40A to40C, andFIGS.4B,5B, and6Bare side views (cross-sectional views) thereof. The covers40A to40C of the first to third modifications are basically similar to the cover40of the first embodiment, each including a first cover portion41and a second cover portion42. Components similar to those in the first embodiment will be denoted by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted. Hereinafter described are configurations different from the first embodiment.

First, the cover40A of the first modification illustrated inFIGS.4A and4Bwill be described. In the cover40of the first embodiment, the base plate43is used as an engagement portion, and the casing30includes the engagement holder32to be engaged with the base plate43. On the other hand, in the cover40A of the first modification, a wall around a peripheral edge of an opening31of a casing30functions as an engagement portion36, and an engagement holder47that engages with the engagement portion36is disposed on a base plate43. The base plate43of the first modification includes two disk-shaped holding walls47aarranged at an interval substantially equal to a thickness of the wall of the casing30in the forward-rearward direction, and a space between the holding walls47ais used as a housing space47bthat houses (engages with) the engagement portion36.

In the first modification, the second cover portion42and the first cover portion41housing the objective optical system unit21both move up and down and from side to side, following the movement of the measurement head14in the upward-downward direction and the rightward-leftward direction. At this time, the first cover portion41moves within the opening31along the engagement portion36while holding the engagement portion36. In addition, an outer periphery (a bottom face47c) of a guide44abuts a peripheral edge of the engagement portion36inside the housing space47bso as to suppress the movement of the first cover portion41. The movement of the first cover portion41in the forward-rearward direction is suppressed by the engagement between the engagement portion36and the holding walls47aof the engagement holder47, and the second cover portion42housing the objective optical system unit21moves back and forth. Accordingly, the cover40A of the first modification can also exert effects similar to those of the first embodiment, and the structure around the opening31of the casing30can be made simpler.

In the cover40B of the second modification illustrated inFIGS.5A and5B, the first cover portion41is composed of a disk-shaped base plate43. The base plate43is engaged with an engagement holder32of a casing30, being capable of moving up and down and from side to side. The second cover portion42is inserted into an insertion hole43adisposed in the base plate43, being relatively movable in the forward-rearward direction. The second modification also offers functions and effects similar to those of the first embodiment and provides the cover40B having a simpler configuration.

The cover40C of the third modification illustrated inFIGS.6A and6Bis used in an ophthalmologic apparatus including stereo cameras (imaging units)23aand23bthat acquire images of a subject's eye E for alignment. In this ophthalmologic apparatus, a measurement optical system22housed in a measurement head14includes optical elements such as an objective optical system unit21, a lens, and an imaging element and also includes the stereo cameras23aand23band light sources24for illumination. A total of four light sources24are disposed in pairs near the stereo cameras23aand23b.

In the cover40C of the third modification, the second cover portion42is a rectangular tubular member having a rectangular shape elongated in the rightward-leftward direction in plan view as illustrated inFIG.6Aso as to house all of the objective optical system unit21, the stereo cameras23aand23b, and the four light sources24. The second cover portion42is not limited to the rectangular tubular member and may be, for example, an elliptical cylindrical member having an elliptical or oval shape in plan view. The second cover portion42may have an appropriate shape according to, for example, design or angles of view and arrangements of the stereo cameras23aand23b.

Furthermore, in the first cover portion41through which the second cover portion42is inserted, a guide44is a rectangular tubular member including a rectangular insertion hole44b, and a base plate43is formed into a rectangular shape. Still further, an engagement holder32with which the base plate43is engaged and an opening31are formed into a rectangular shape but are not limited thereto. According to moving distances of the measurement head14in the upward-downward direction and the rightward-leftward direction, these members may have a shape or size that appropriately covers the opening31without hindering the movement of the objective optical system unit21and the stereo cameras23aand23b. The cover40C of the third modification may also include the engagement holder47as in the first modification or may include the first cover portion41composed of the base plate43as in the second modification.

The cover40C of the third modification houses the objective optical system unit21, the stereo cameras23aand23b, and the four light sources24but is not limited thereto. For example, similarly to the second cover portion42of the first embodiment, the cover40C may be a cylindrical member and house the objective optical system unit21. In this case, an inward flange44aor the base plate43of the first cover portion41is provided with openings on the right and left sides of an insertion hole44bso that the stereo cameras23aand23band the light sources24can be seen through the openings. A glass plate for preventing penetration of dust and the like is desirably disposed in the openings. Even with such a configuration, the first cover portion41and the second cover portion42move up and down and from side to side together with the objective optical system unit21, the stereo cameras23aand23b, and the light sources24. In addition, even when the objective optical system unit21, the stereo cameras23aand23b, and the light sources24move back and forth relative to the first cover portion41, the openings are located on optical paths (on optical axes) of the stereo cameras23aand23b. Accordingly, it is possible to capture images of the subject's eye E by the stereo cameras23aand23bthrough the openings of the first cover portion41.

Although the ophthalmologic apparatus of this disclosure is described based on the embodiment and modifications, the specific configuration is not limited by these embodiment and modifications. Changes or additions of the design are allowed without departing from the gist of the disclosure according to the claims.

For example, in the above embodiment and modifications, the measurement head14moves up and down, from side to side, and back and forth, but the measurement head14may be configured to rotate about an axis parallel to Y-axis. Such a configuration makes it possible to acquire eye information of a subject's eye E not only from the front but also from a desired angle. In addition, the measurement head14may be configured to move in any one direction or two directions of the upward-downward direction, the rightward-leftward direction, and the forward-rearward direction.

In the embodiment, the monitor18is rotatable by the rotary support mechanism18b, but the present invention is not limited thereto. For example, the monitor18may be fixed to the casing30in a non-rotatable manner. Furthermore, the monitor18may be detachable from the casing30and may be connected to the control unit19, enabling transmission and reception of data by short-range wireless communication such as Wi-Fi (registered trademark) or Bluetooth (registered trademark).