Apparatus and method for testing visual accuity and contrast sen

Details Apparatus and method for testing visual accuity and contrast sen Apparatus and method for testing visual accuity and contrast sen

1991-05-16

1993-06-01

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351246, A61B 302

Patent

active

052164586

ABSTRACT:
A vision testing apparatus and a method for testing vision in terms of contrast sensitivity and spatial frequency response are provided. The apparatus and method utilize a plurality light-polarizing optotypes which are provided on sheets of an oriented polymeric material. The optotypes are presented one at a time to a patient in conjunction with a polarizing filter such that rotation of the filter relative to the optotype will cause the contrast of the optotype to vary from a first condition wherein the pattern of the optotype is indistinguishable from its background to a second condition wherein the optotype is seen at a maximum level of contrast. The patient will indicate the point at which he or she first sees the optotype. The sequential presentation of a series of optotypes having patterns which vary in their spatial frequencies will provide a measure of both contrast sensitivity and spatial frequency response for each patient tested.

REFERENCES:
patent: 2280297 (1942-04-01), Neumueller et al.
patent: 2543179 (1951-02-01), Land et al.
patent: 4365873 (1982-12-01), Ginsburg
patent: 4844607 (1989-07-01), Andera et al.

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