Eye refractometer

Details Eye refractometer Eye refractometer

1986-11-12

1989-07-18

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 310

Patent

active

048488968

ABSTRACT:
The present invention is directed to an eye refractometer, one embodiment of which, includes two-aperture stops positioned substantially conjugate with the pupil of the eye to be examined. Further, a two-dimensional light position detecting device is provided for detecting the two-dimensional positions of two light beams passed through the light beam incidence area of the pupil of the eye to be examined, reflected by the fundus of the eye to be examined and passed through the light exit area of the pupil of the eye to be examined. A processor is provided for obtaining the refractive value of the eye from the output of the two-dimensional light position detecting device.

REFERENCES:
patent: 2114984 (1938-04-01), Reason
patent: 4266862 (1981-05-01), Trotscher et al.
patent: 4367019 (1983-01-01), Kitao et al.
patent: 4390255 (1983-06-01), Nohda et al.
patent: 4400070 (1983-08-01), Isono et al.
patent: 4421391 (1983-12-01), Matsumura et al.
patent: 4529280 (1985-07-01), Nohda
patent: 4678297 (1987-07-01), Ishikawa et al.

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