Ophthalmic positioning apparatus

Details Ophthalmic positioning apparatus Ophthalmic positioning apparatus

1986-01-29

1989-03-21

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 314

Patent

active

048137782

ABSTRACT:
An ophthalmic positioning apparatus has: an optical index projection system for projecting a positioning index onto the cornea of an eye to be examined; and optical focusing system for forming a cornea-reflected image of the positioning index on a predetermined focusing plane; an observing device for observing the cornea-reflected image of the positioning index which is formed on the predetermined focusing plane; and a moving device for moving the optical index projection system, the optical focusing system, and the observing device along at least an operation distance adjustment direction; the positioning index being adapted to allow an observer to identify an inverted state of an index image through the observing device when the positioning index is projected onto a surface position of the cornea of an eye and onto a central position of the curvature of the cornea.

REFERENCES:
patent: 4257687 (1981-03-01), Kohayakawa
patent: 4511227 (1985-04-01), Nunokawa et al.

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