Abstract
One hundred and twenty men were tested with 5 pseudo-isochromatic tests of color vision, the American Optical Company, Ishihara, Meyrowitz, Bostrom, and Bostrom-Kugelberg tests, and with the Royal Canadian Navy color vision test lantern. The results obtained on the lantern were used to classify the subjects into two groups: color normal (86 men) and color deficient (34 men). The criterion of color deficiency used in this study, i.e., one or more errors on the RCN lantern, was found to correlate highly with the total number of plates read correctly on the five pseudo-isochromatic tests.Each of the pseudo-isochromatic tests was evaluated as a whole, and plate-by-plate, in terms of its efficiency for separating the color normal from the color deficient. It was found that the Bostrom-Kugelberg test is by far the best all-around test of color deficiency evaluated in this experiment. The Ishihara test is next best. Although the AO test differentiates clearly between the color normal and color deficient, many of the plates are individually non-diagnostic. The Bostrom and Meyrowitz plates are, in general, unsatisfactory.Incidental findings show that neither visual acuity nor age is related to performance on the tests used in this experiment.
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