Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent
1977-11-21
1981-05-12
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Folding
351 13, A61B 310
Patent
active
042668620
ABSTRACT:
The invention contemplates a refractometer that images a test mark on the retina and is automatic in its determination of both refractive-power and astigmatism parameters, for the eye under examination. An imaging lens serves both (1) to project the test mark to the retina and (2) to convey that image for refocus external to the eye, to a scanner having the ability to digitally establish the eye's focal length. In the process of establishing the eye's focal length, the instrument automatically positions the imaging lens to best serve infinity viewing by the eye, and a prism then rotates the test mark while the scanner photoelectrically tracks the refocused image for the angles at which response is at a maximum, thus establishing astigmatism parameters. The instrument provides selective direct indication or print-out of the automatically determined parametric values.
REFERENCES:
patent: 3572910 (1971-03-01), Koester
patent: 3819256 (1974-06-01), Bellows et al.
patent: 3824005 (1974-07-01), Woestman
patent: 3880501 (1975-04-01), Munnerlyn
patent: 3883233 (1975-05-01), Guilino
patent: 4125320 (1978-11-01), Rassow
Trotscher Otto
Wiedmann Erwin
Bovernick Rodney B.
Carl Zeiss-Stiftung
Corbin John K.
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