CHROMATIC ROD-CONE INTER ACTION DURING DARK-ADAPTATION

Chromatic rod-cone interaction in mesopic vision was investigated by m easuring chromaticity coordinates of spectral lights 3 deg extrafoveal ly during long-term dark adaptation, under conditions where the eye wa s chromatically adapted. It was concluded that (a) the chromaticity sh ift obtained between the cone-plateau period and the dark-adapted stat e is due, at least under some conditions, to rod signals elicited by t he test stimulus, (b) the chromaticity points of cone-mediated colors may change in different directions in the chromaticity diagram as an e ffect of the rod intrusion, (c) cone-cone and rod-cone color-mixture p rocessing may, at least under some conditions, be different, and (d) c hroma-related processes of rods and cones tend to suppress each other, with rods dominating at low and cones at high mesopic intensities. (C ) 1998 Optical Society of America. [S0740-3232(98)00911-9]. OCIS codes : 330.1720, 330.5310, 330.7320.