A Screening Test for Defective Red-Green Vision*

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Abstract
For the purpose of a screening test, 18 plates have been selected from the 46 plates of the American Optical Company series of 1940. The selection was made on the basis of a critical score between 365 normal subjects and 117 subjects classified as having defective red-green vision. The original classification of the subjects was made by the use of a wider and more highly diagnostic set of tests not generally available at the present time. Specific directions are included for giving and scoring the 18-plate series, which is found to be an effective and readily available means of differentiating between normal and defective color vision.

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