Source: http://www.google.com/patents/US7216980?dq=%22peter+l+basel%22+%22lsi+logic%22
Timestamp: 2017-11-20 20:26:46
Document Index: 778460631

Matched Legal Cases: ['art 31', 'art 23', 'art 210', 'art 210', 'art 210', 'art 210', 'art 35']

Patent US7216980 - Eye characteristic measuring apparatus - Google Patents
The aberration and refraction power data of an eye to be examined obtained from a first light reception unit and cornea data of the eye to be examined are correlated with each other so as to be overlaid accurately. A first signal and a second signal are concurrently captured, and the optical characteristics...http://www.google.com/patents/US7216980?utm_source=gb-gplus-sharePatent US7216980 - Eye characteristic measuring apparatus
Publication number US7216980 B2
Application number US 10/470,737
PCT number PCT/JP2002/001096
Also published as CA2437345A1, EP1364612A1, EP1364612A4, US20040070730, WO2002064030A1
Publication number 10470737, 470737, PCT/2002/1096, PCT/JP/2/001096, PCT/JP/2/01096, PCT/JP/2002/001096, PCT/JP/2002/01096, PCT/JP2/001096, PCT/JP2/01096, PCT/JP2001096, PCT/JP2002/001096, PCT/JP2002/01096, PCT/JP2002001096, PCT/JP200201096, PCT/JP201096, US 7216980 B2, US 7216980B2, US-B2-7216980, US7216980 B2, US7216980B2
Patent Citations (16), Referenced by (14), Classifications (12), Legal Events (3)
Eye characteristic measuring apparatus
US 7216980 B2
The aberration and refraction power data of an eye to be examined obtained from a first light reception unit and cornea data of the eye to be examined are correlated with each other so as to be overlaid accurately. A first signal and a second signal are concurrently captured, and the optical characteristics and cornea shape of the eye to be examined are measured concurrently or almost concurrently. A measuring unit (111) measures dioptrical characteristics based on a first light reception signal from the first light reception unit (23), and measures a corneal topography based on a second light reception signal from the second light reception unit (35). A coordinates setting unit (112) converts signal in first and second coordinate systems, corresponding to the eye to be examined, included in the first and second reception signal into signal in reference coordinate systems respectively. A conversion unit (116) synthesizes the first and second optical characteristics of the eye to be examined obtained by the measuring unit (111) in association with each reference coordinate system formed by the coordinates setting unit (112). A measuring timing determining unit (117) determines the measuring timing of the first signal and the second signal to be subjected to measuring operation based on the first and/or second signal.
The present invention relates to an eye characteristic measuring apparatus. Particularly, the invention relates to an eye characteristic measuring apparatus which measures an optical characteristic of an eye, and correlates this with a specified coordinate system of a subject eye, a measuring apparatus or a surgical apparatus, and displays it. Besides, the invention particularly relates to an eye characteristic measuring apparatus which decides measuring timings of the optical characteristic of the subject eye and the corneal shape, and measures these simultaneously or substantially simultaneously.
In recent years, an optical equipment used for medicine has been developed variously to a high degree. Especially in ophthalmology, the optical equipment becomes widespread as an optical characteristic measuring apparatus for testing an eye function, such as refraction of an eye or adjustment thereof, and the inside of an eye. In the measurement results of these various tests, it becomes important that for example, a patient's eye to be measured as a test object is put in what decision factor for measuring timing.
According to first solving means of the invention, an eye characteristic measuring apparatus comprises:
FIGS. 7(A)–7(C) are explanatory views (2) of eye characteristic measurement.
FIGS. 9(A)–9(C) are explanatory views for obtaining a pupil edge from a Hartmann image.
FIG. 8 is an explanatory view of the anterior eye image. In the drawing, “×” denotes the pupil center, “◯” denotes the corneal vertex (center), and an asterisk mark denotes an alignment marker. An actual alignment marker may have a different shape such as a circle. The pupil center is mainly treated as the origin of the surgical apparatus. The corneal center (vertex) is mainly treated as the center of the CCD or the machine. As shown in the drawing, at the step S101, in addition to the image of the Placido's disk 1, the light from the second light source part 31 appears as a bright point in the vicinity of the corneal vertex of the subject eye. While the anterior eye image of the subject eye is observed, the alignment of the eye characteristic measuring apparatus is performed in the XY direction with respect to the subject eye, and at this time, the alignment in the Z direction is also performed by the adjusting optical system 50.
At the step S105, with respect to the first measurement system, the pupil edge on the Hartmann wavefront sensor image obtained from the first light receiving part 23 can be obtained by the image processing. Here, since the obtained pupil edge is influenced by aberrations and is distorted, the arithmetic part 210 corrects the shape of the pupil edge from the relation between the Hartmann dot image and the reference point obtained at the step S103. For example, the arithmetic part 210 obtains a function for correction by the least squares approximation similarly to the case where the wavefront aberrations are obtained from the Hartmann wavefront sensor, inputs the position of the pupil edge on the Hartmann wavefront sensor image to the function obtained now, and calculates the position of the correct pupil edge. Besides, when the correct position of the pupil edge is obtained, the arithmetic part 210 causes a pixel in the inside of the pupil to have 1, and causes the outside to have 0 to obtain the barycenter, so that the position of the pupil center in the CCD coordinate system is obtained. For example, the center of a circle or an ellipse can be made the barycenter. In this way, as shown in the upper drawing of FIG. 6(A), the pupil center (×) is measured. The conversion from the first coordinate system to the newly defined reference coordinate system is performed by moving the origin of the reference coordinate to the pupil center, and by changing the number of pixels of the CCDs into the actual distance by the magnification of the optical system.
Besides, at the step S105, with respect to the second measurement system, the arithmetic part 210 obtains the pupil edge by the image processing from the coordinate system for the corneal measurement obtained from the second light receiving part 35 and set by the processing of the step S192, that is, the second coordinate system as well, and calculates the position of the pupil center in the second coordinate system. In this way, the pupil center (×) is obtained, and the upper drawing of FIG. 6(B) is measured. At this time, the conversion from the second coordinate system to the reference coordinate system is the movement of the pupil center. At the measurement of an abnormal eye such as keratoconus, in the case where a part of the pupil edge is chipped in the Hartmann wavefront sensor image, measures can be taken by performing estimation of the chipped portion or the like to obtain the barycenter.
A table 271 is a table showing the decision factor for measuring timing which can be detected by the first signal and the second, and the decision factor for measuring timing includes, for example, a blink, a tear film, a pupil diameter, an eyelid opening, and a fixation state. Besides, with respect to the fixation state, according to whether the pupil center is within a specified distance from the vertex or is largely deviated therefrom, it is possible to judge the fitness as to whether measurement can be performed or not. Besides, a ⊚ mark, a ◯ mark, a Δ mark, and a × mark in the drawing given to the respective decision factors for measuring timing of the first signal and the second signal respectively denote good measurement, measurability, poor measurement, and non-measurability according to the respective signals.
According to the invention, as described above, it is possible to provide the eye optical characteristic measuring apparatus which correlates the aberrations of the subject eye or the refractive power data obtained from the first light receiving part with the corneal data of the subject eye obtained from the second light receiving part so that they can be precisely superimposed. Besides, according to the invention, pupils of both are visually compared to make positions coincide with each other, so that coordinates of the corneal shape measurement using the same image as the alignment system and those of the wavefront measurement can be made to coincide with each other.
US4859051 Dec 24, 1987 Aug 22, 1989 Tokyo Kogaku Kikai Kabushiki Kaisha Eye testing apparatus
US6685320 * Apr 16, 2002 Feb 3, 2004 Kabushiki Kaisha Topcon Opthalmic characteristic measuring apparatus
JP2612263B2 Title not available
JP2942312B2 Title not available
JP2000237135A Title not available
JP2000254099A Title not available
JP2000262468A Title not available
JP2000287930A Title not available
JPH0575412B2 Title not available
JPH0852112A Title not available
JPH1033483A Title not available
JPH07136120A Title not available
JPH09201334A Title not available
JPH10305013A Title not available
US7270413 * Jan 29, 2004 Sep 18, 2007 Kabushiki Kaisha Topcon Ophthalmic data measuring apparatus, ophthalmic data measurement program and eye characteristic measuring apparatus
US9122926 Jul 19, 2012 Sep 1, 2015 Honeywell International Inc. Iris recognition using localized Zernike moments
US20060170865 * Jan 29, 2004 Aug 3, 2006 Kabushiki Kaisha Topcon Ophthalmic data measurement device, ophthalmic data measurement program, and eye characteristic measurement device
US20090161068 * Dec 20, 2007 Jun 25, 2009 Ming Lai Ophthalmic Measurement Apparatus
U.S. Classification 351/205, 351/221, 351/212, 351/211
International Classification A61B3/103, A61B3/107, A61B3/10
Cooperative Classification A61B3/107, A61B3/1015
European Classification A61B3/10F, A61B3/103, A61B3/107
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MIHASHI, TOSHIFUMI;HIROHARA, YOKO;REEL/FRAME:014467/0638;SIGNING DATES FROM 20030806 TO 20030808