Abstract

Chromatic rod–cone interaction in mesopic vision was investigated by measuring chromaticity coordinates of spectral lights 3 deg extrafoveally during long-term dark adaptation, under conditions where the eye was chromatically adapted. It was concluded that (a) the chromaticity shift obtained between the cone-plateau period and the dark-adapted state is due, at least under some conditions, to rod signals elicited by the test stimulus, (b) the chromaticity points of cone-mediated colors may change in different directions in the chromaticity diagram as an effect of the rod intrusion, (c) cone–cone and rod–cone color-mixture processing may, at least under some conditions, be different, and (d) chroma-related processes of rods and cones tend to suppress each other, with rods dominating at low and cones at high mesopic intensities.

© 1998 Optical Society of America

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