Slit pattern projecting apparatus having alignment detecting mea

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding

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Details

351 14, 351 16, 354 62, A61B 314, A61B 310, G03B 2900

Patent

active

043570798

ABSTRACT:
A slit lamp device having a slit pattern projecting optical system for projecting an illumination light in a pattern of a slit to a patient's eye. An alignment detecting device is provided for detecting the alignment between the optical axis of the projecting system and the axis of the patient's eye. The device comprises one or more light receiving elements such as phototransistors which are located at one or both sides of the projecting optical axis and in the slit plane.

REFERENCES:
patent: 4175839 (1979-11-01), Muller et al.
patent: 4219258 (1980-08-01), Araki et al.
patent: 4252420 (1981-02-01), Kohayakawa
patent: 4257687 (1981-03-01), Kohayakawa

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