Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1996-11-25
1999-03-23
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351247, 351211, 600558, A61B 310
Patent
active
058867678
ABSTRACT:
This invention relates to certain improvements in the art of keratometry and, more particularly, to the use of television techniques to determine the shape of the corneal surface of an eye in essentially real-time. Paired television images of diffuse reflections from the cornea are produced by projecting an infra-red illuminated pattern onto the cornea. These diffuse reflections are compared by triangulation to define the corneal contour. The resultant data are processed by a conventional microcomputer to derive surface contour for display, the shape data so generated in a form for instant use. Compensation for image brightness at each location is provided by altering projected image brightness to compensate for inherent non-linearity of diffuse image brightness versus position in the image plane. The liberalization reduces the complexity of the digital signal processing required for producing a contour map of the cornea. The present invention specifically relates to devices that are used in clinical practice.
REFERENCES:
patent: 3169459 (1965-02-01), Friedberg et al.
patent: 4761071 (1988-08-01), Baron
patent: 5735283 (1998-04-01), Snook
Mai Huy
Schaap Robert J.
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