Eye refraction measuring apparatus including optical path separa

Details Eye refraction measuring apparatus including optical path separa Eye refraction measuring apparatus including optical path separa

1993-08-24

1996-06-04

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351214, 351221, A61B 310

Patent

active

055238092

ABSTRACT:
An eye refraction measuring apparatus for ophtalmology can separate a projected light beam from a reflected light beam from an eye fundus without using a special optical member such as an apertured-mirror. As a result, the constitution of the apparatus can be simplified and miniturized, a the measurable and measurement precision can be the improved, distribution of refractivity of a pupil in radial directions can be measured, and a small pupil and a cloudy eye can be easily measured.

REFERENCES:
patent: 4021102 (1977-05-01), Ilzuka
patent: 4162828 (1979-07-01), Trachtman
patent: 4372655 (1983-02-01), Matsumura et al.
patent: 4376573 (1983-03-01), Matsumura et al.
patent: 4744648 (1988-05-01), Kato et al.
patent: 4761070 (1988-08-01), Fukuma

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