Abstract

We studied how much blue, green, or red light had to be subtracted from or added to white (CIE 1931 chromaticity coordinates x = 0.35 and y = 0.35) to obtain veridical hue perception (blue, green, red, or their complementary colors) at various eccentricities in the temporal visual field. The smallest increment/decrement necessary for veridical hue perception was expressed as a linear distance from the white in chromaticity coordinates. When the stimulus had the same retinal size at all eccentricities, in the discrimination threshold (linear distance in chromaticity coordinates) increased toward the periphery of the visual field. However, when the stimulus was M-scaled by magnifying it with increasing eccentricity in inverse proportion to the density distribution of ganglion-cell receptive fields across the human retina,¹ the discrimination threshold became independent of visual field location.

© 1988 Optical Society of America