Abstract
Two experiments are reported that examine the effects of variations in viewing duration, viewing distance, and illumination level on performance with three popular pseudoisochromatic tests of color blindness. Highly significant effects of these conditions are obtained with a sample of color-normal observers, but the three tests also differ markedly in their susceptibility to variations in these viewing conditions. Results are discussed both in terms of practical implications of test administration under nonstandardized conditions and in terms of other likely visual processes assessed by these tests.
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