Eye refractometer

Details Eye refractometer Eye refractometer

1978-09-21

1981-10-06

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 14, A61B 310

Patent

active

042931983

ABSTRACT:
An eye refractometer is provided with a projection optical system for projecting test beams forming test patterns such that the central ray of each test beam passes through the pupil of the eye to be inspected while being spaced apart from the optic axis in order to form test patterns corresponding to three meridians forming 60.degree. with each, a focusing lens disposed in the projection optical system and movable only in one direction during one measurement, and a beam detecting device for detecting the reflected images of the test patterns by the retina of the eye and generating electrical signals corresponding to the three meridians.

REFERENCES:
patent: 3819256 (1974-06-01), Bellows et al.
patent: 3883233 (1975-05-01), Guilino
patent: 4021102 (1977-05-01), Iizuka

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