Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1995-12-12
1997-11-04
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351247, 351211, A61B 310
Patent
active
056845626
ABSTRACT:
An ophthalmic apparatus for measuring the shape of the cornea of the eye, capable of measuring the pupil in a natural state of vision is provided. An illuminating light source illuminates a cornea shape measuring pattern with red or infrared light to project an image of the cornea shape measuring pattern on the cornea of the eye, and a CCD camera picks up the image of the cornea shape measuring pattern formed on the cornea. A computer analyzes the image of the cornea shape measuring pattern to obtain data of the shape of the cornea and processes the data to calculate the regional curvatures of regions of the cornea. An intraocular illuminating light source illuminates the interior of the eye with red or infrared light, and the CCD camera picks up an image of a pupillary region illuminated by the light emitted by the intraocular illuminating light source and reflected by the interior of the eye. The computer analyzes the image of the pupillary region to obtain the data of the pupillary region and processes the data to determine the shape or the size of the pupil in a natural state of vision.
REFERENCES:
patent: 3589107 (1971-06-01), Ishikawa
patent: 4993826 (1991-02-01), Yoder, Jr.
patent: 5214456 (1993-05-01), Gersten
patent: 5357294 (1994-10-01), Shimizu et al.
patent: 5469234 (1995-11-01), Konishi
patent: 5500697 (1996-03-01), Fujieda
Mai Huy
Nidek Company, Ltd.
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