Farnsworth explored past theories on color vision and blindness. He
wrote the following statement regarding color vision:
For industrial purposes color
vision can be divided usefully into three groups: normal, partially
defective, and color blind. Two standard tests are sufficient to
make this analysis:
1.Pseudo-isochromatic
Plates for Testing Color Perception (Revised Selection), American
Optical Company, Southbridge, Massachusetts.
2.Farnsworth
Dichotomous Test, Psychological Corporation, 522 Fifth Avenue, New
York 18, N.Y.
A desk-type lamp has been designed
to furnish standard illumination for these tests: “ADE10” Easel
Lamp, Macbeth Corporation, 227 West 17th St., New York
11, N.Y.
The three degrees of color vision
are diagnosed in this way:
Pass-A.O. Plates-NORMAL
Fail-A.O. Plates-PARTIALLY
DEFECTIVE
Pass-Dichotomous-PARTIALLY
DEFECTIVE
Fail-Dichotomous-COLOR BLIND
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