Eye-refractometer device

Details Eye-refractometer device Eye-refractometer device

1980-05-23

1982-10-12

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 14, 351 7, A61B 314, A61B 310

Patent

active

043536255

ABSTRACT:
An eye-refractometer device includes a light receiving member having a pair of photoelectric elements for detection of astigmatic axis and a pair of photoelectric elements for detection of diopter of an eye provided on the light receiving surface of said member off the optical axis of a condenser lens. Said pair of astigmatic axis detection photoelectric elements are positioned on a straight line normal to the scanning direction of the beam projected through said projection optical system. Said pair of diopter detection photoelectric elements are positioned on a line extending in said scanning direction. The eye-refractometer device has a highly improved accuracy of measurement of diopter.

REFERENCES:
patent: 3136839 (1964-06-01), Safir
patent: 3715166 (1973-02-01), Leighty et al.
patent: 4173398 (1979-11-01), Okamoto

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