Compact subjective refractive instrument

Details Compact subjective refractive instrument Compact subjective refractive instrument

1977-09-30

1979-12-18

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 36, 351 34, A61B 302

Patent

active

041791967

ABSTRACT:
A compact ophthalmic instrument for refraction of patient's eyes is obtained by substantial folding of the optical system. The optical system is folded in one location using a reflection means that moves to vary the location of a target image being viewed by a patient for identifying the spherical power of a corrective lens, if any, required by the patient. A second folded portion of the optical system contains a cylinder means for cylindrically varying the target image.

REFERENCES:
patent: 3669530 (1972-06-01), Guyton
patent: 4015889 (1977-04-01), Humphrey
patent: 4105302 (1978-08-01), Tate

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