Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1987-06-30
1989-07-18
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351243, 351246, A61B 302
Patent
active
048488984
ABSTRACT:
To provide for an easy and accurate color vision tester, a plurality of yellow, red and green lights are mounted, or projected, onto a display, with the yellow lights providing for the background luminance while the red and green lights providing for a mixture of red and green luminance. Different patterns on the display are formed by a combination of the red and green lights. A particular pattern can be selected from among the various patterns by a pattern select circuit. The intensity of the red to green lights can be inversely varied so that different ratios of intensity for the selected pattern may be presented to an observer. Each of these ratios corresponds to a certain type of color vision. Therefore, by determining whether an observer is able to discern the pattern from the background in a particular intensity setting, the type of color vision an observer has can easily be ascertained.
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"A Red-Green Anomaloscope Using Light Emitting iodes" by J. E. Saunders, Dec. 15, 1975, p. 872.
"A Solid State Anomaloscope" by S. J. Dain, G. Strange and R. Boyd, 1980, p. 182 of Chapter 4.
"Procedures for Testing Color Vision" by Committee on Vision Assembly of Behavioral and Social Sciences National Research Council, 1981, Chapter 3.
"Procedures for Testing Color Vision" by Committee on Vision Assembly of Behavioral and Social Sciences National Research Council, 1981, Chapter 3.
LKC Technologies, Inc.
Ryan J. P.
Sikes William L.
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