Abstract

While color-vision characteristics of tritanopia (blue–yellow deficiency) are well known to occur with small fields in the central fovea, the possibility of similar confusions as a function of brief duration has previously only been suggested. The problem has been investigated in this study by determining the color names given by nine color-normal and two deuteranopic observers to spectral stimuli from 565 to 590 mμ and to a white light. The test stimuli, all presented foveally, subtended diameters of 54, 21, and 11 min at durations of 200 and 20 msec. For stimuli presented at small subtense and short duration, green was sometimes seen as blue or blue–green, a neutral band was found in the yellow–green (570–580 mμ), and no confusion was found between reds and greens. The degree of tritanopic-like color confusions in the fovea is related to both the exposure time and the size of the test area. The results are discussed in relation to the foveal vs small-field characteristics of apparent tritanopia.

© 1967 Optical Society of America

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