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January 4, 1941

Pseudo-lsochromatic Plates for Testing Color Perception

JAMA. 1941;116(1):86. doi:10.1001/jama.1941.02820010088046

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This consists of a paneled folder containing forty-six charts of the general type devised by Ishihara but presenting many improvements, evident only after a comparative test on the same subjects. The panels are not numbered and are so arranged that any desired pair may be exhibited alone and in any order. These provisions will facilitate the detection of malingerers. Inserted in a pocket in the folder, which is of substantial construction, is a pamphlet giving a brief discussion of color blindness, description of types, and instructions for making the tests and interpreting the results. There is also a brief bibliography and a tabular key for interpreting each plate. Most of the plates are applicable only to red-green defects, but there are several especially designed for the detection of blue-yellow defects. On the whole the equipment makes possible a some-what more comprehensive examination but the technic is greatly simplified as compared

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