Ophthalmic measuring apparatus

Details Ophthalmic measuring apparatus Ophthalmic measuring apparatus

1989-12-28

1992-03-24

Dzierzynski, Paul M.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351246, 351214, 351205, A61B 310

Patent

active

050981811

ABSTRACT:
An ophthalmic measuring apparatus in which a laser beam is projected at a selected spot in the eye and light scattered therefrom is received and processed for ophthalmic measurement. The light scattered from the selected spot in the eye is received by a photoelectric converter comprised of a plurality of avalanche photodiodes or by a photomultiplier via a liquid crystal video module comprised of a plurality of liquid crystal elements. Signals from the avalanche photodiodes or liquid crystal elements disposed at surrounding portions are subtracted from signals from those at the central portion to remove a noise component based on the light scattered from the portions surrounding the selected spot in the eye.

REFERENCES:
patent: 4257687 (1981-03-01), Kohayakawa
patent: 4711542 (1987-12-01), Ichihashi et al.

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