Abstract

Previous studies have shown that red and green CRT lights that are approximately equiluminant for normal adults produce strong pupillary constrictions to both directions of exchange when one is suddenly substituted for the other. In contrast, protanopes and infants less than two months old show vigorous responses only to red → green exchanges and not to green → red exchanges of these lights. The current experiment presented red → green exchanges to three- and seven-week-old infants and to adult normals and protanopes. Among the lights tested were red-green pairs that were approximate scotopic, protanopic, and normal trichromatic matches. Protanopes and normals produced approximately equal pupillary constrictions at their respective brightness matches. The infants showed approximately equal pupillary constrictions at protanopic match luminances but quite asymmetric responses at the scotopic and normal match luminances.

© 1988 Optical Society of America