Keratographic instrument using holographic placido illuminator t

Details Keratographic instrument using holographic placido illuminator t Keratographic instrument using holographic placido illuminator t

1991-06-03

1993-03-16

Arnold, Bruce Y.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351221, 351246, 359 1, 359 19, A61B 3107, G03H 100

Patent

active

051948826

ABSTRACT:
A hologram is used to project an image of a pattern similar to a placido upon the cornea of a subject. By viewing the reflection of the pattern in the subject's cornea, one may measure the curvature of the cornea. The use of the hologram in the keratometer system allows the pattern to be imaged at infinity, thereby minimizing any error which might otherwise result from incorrect assumptions about the cornea position.

REFERENCES:
patent: 4569576 (1986-02-01), Karpov et al.
patent: 4662730 (1987-05-01), Outwater et al.
patent: 4863260 (1989-09-01), Gersten et al.
patent: 4917458 (1990-04-01), Matsumura

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