Method and apparatus for eye refraction determination

Details Method and apparatus for eye refraction determination Method and apparatus for eye refraction determination

1979-03-30

1981-08-11

Clark, Conrad J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

351 29, A61B 302

Patent

active

042831261

ABSTRACT:
Method and apparatus for determining eye refraction using corrective lenses comprising projecting the corrective lens by means of an optical system into the pupil of the eye or in a predetermined spaced relation in front of said pupil, e.g., via a splitting mirror; this permits sight testing without the use of test spectacles and impairment of field of vision.

REFERENCES:
patent: 3524702 (1970-08-01), Bellows et al.
patent: 3572910 (1971-03-01), Koester
patent: 3737217 (1973-06-01), Haines et al.
patent: 3904280 (1975-09-01), Tate

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