Eye refractive power measurement apparatus

Details Eye refractive power measurement apparatus Eye refractive power measurement apparatus

1997-04-29

1999-02-16

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, A61B 310

Patent

active

058726144

ABSTRACT:
A type of eye refractive power measurement apparatus is capable of measuring the refractive power of left and right eyes through a common measurement optical system and without movement of the entire apparatus. The measurement apparatus includes a measurement system in which a beam of light is projected on the fundus of an eye under examination. The light reflected from the fundus of the eye is received by a light-receiving element. Based on the photoelectric output of the light-receiving element, the refractive power of the eye being examined is measured. A left eye/right eye switching prism selectively guides the light from the measurement system to one of the eyes which is to be subjected to examination. The light is also guided by the switching prism from the selected eye to the measurement system.

REFERENCES:
patent: 5355253 (1994-10-01), Nanjo et al.
patent: 5371558 (1994-12-01), Kohayakawa
patent: 5483305 (1996-01-01), Kohayakwa

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