Apparatus for detecting the position of a patient's eye in ophth

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type

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A61B 314

Patent

active

044538081

ABSTRACT:
In an ophthalmoscopic instrument such as an eye fundus camera or an eye refractometer, a device is provided for detecting the position of a patient's eye. The device includes a target projecting system for projecting a light beam to the patient's eye, an imaging lens for imaging the light beam as reflected at the patient's eye and a detector for sensing the reflected light beam. A chopper is provided for selectively passing the reflected light beam to the detector for making it possible to produce a signal which includes informations of imaging condition of the light beam at the detector.

REFERENCES:
patent: 4253743 (1981-03-01), Matsumura

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