Apparatus for testing color discrimination in the human visual s

Details Apparatus for testing color discrimination in the human visual s Apparatus for testing color discrimination in the human visual s

1997-06-04

1999-08-17

Manuel, George

Surgery

Diagnostic testing

Eye or testing by visual stimulus

A61B 302

Patent

active

059386207

ABSTRACT:
The present invention is directed to an automated determination of the sequence of color caps in a color spot or color arrangement test, such as Farnsworth-Munsell 100-Hue Test for determining the color discrimination of human beings. To that end, on or in the color caps, locations (sites) are fixed, at which magnets can be mounted. The distribution of magnets and voids (absence of magnets) are different for each color cap, among the fixed locations in the color caps and thus encode the color caps. A different type of encoding can be attained by creating variously strong magnetic fields by use of various strength magnets in the color cap. Magnetic field detectors are mounted at suitable points in the surface in which the color caps rest in the tray. Using these magnetic field detectors and corresponding electronics, the sequence of the color caps is determined. By means of a symmetry-breaking structure on the color caps or by suitable magnets of different strength on or in the color caps, a reliable evaluation secure against rotation of color caps is made possible.

REFERENCES:
patent: 4697915 (1987-10-01), Hayashi et al.
patent: 5280323 (1994-01-01), Alvarez et al.
Donaldson, G.B., Instrumentation for the Farnsworth-Munsell 100-hue test*, JOSA Letters, pp. 248-249, 1977.
Schnelder, T., Einfuhrung in die Farbsinnprufung, Augenarztliche Untersuchungsmethoden, pp. 29-35, 1989.

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