Eye refractometer

Details Eye refractometer Eye refractometer

1982-06-02

1986-05-27

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 310

Patent

active

045912475

ABSTRACT:
An eye refractometer comprising a measuring target projection optical system for projecting a measuring target image to the eye fundus of a patient's eye by means of a pair of beams of light from a measuring target; a rotating device for rotating the pair of beams of light around the optical axis; a measuring target image-forming optical system for forming a target image of the beams of light projected through the measuring target image projected to the eye fundus; a detection device for two-dimensionally detecting the position of the target image formed by the image-forming optical system on a plane perpendicular to the optical axis; and an operating circuit for obtaining a refractive power of the eye along a radial line passing through the centers of the pair of beams of light by means of the signal from the detection device.

REFERENCES:
patent: 3614214 (1971-10-01), Cornsweet et al.
patent: 4173398 (1979-11-01), Okamoto
patent: 4266862 (1981-05-01), Trotscher
patent: 4293198 (1981-10-01), Kahayakawa et al.
patent: 4293199 (1981-10-01), Wada et al.
patent: 4304468 (1981-12-01), Wada et al.
patent: 4306778 (1981-12-01), Wada et al.
patent: 4353625 (1982-10-01), Nohda et al.

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