Contrast sensitivity tester

Details Contrast sensitivity tester Contrast sensitivity tester

1993-07-13

1995-01-10

Gross, Anita Pellman

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351234, 351237, 351239, 351243, A61B 302, A61B 3032

Patent

active

053811968

ABSTRACT:
A device for testing visual contrast sensitivity is disclosed whereby the contrast between a vectographically polarized test symbol and a reference background may be continuously varied by changing the direction of polarization of a polarization analyzer situated along the test axis. The invention is practiced by providing a chart projector or a conventional refractor with a rotatable analyzer.

REFERENCES:
patent: 2206303 (1940-07-01), Neumueller et al.
patent: 2280297 (1942-04-01), Neumueller et al.
patent: 2933977 (1960-04-01), Landis
patent: 2976764 (1961-03-01), Hyde et al.
patent: 5216458 (1993-06-01), Andera et al.

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