Shape of the red and green color zone gradients.

Abstract

Color sensitivity at the boundaries of the red and green zones along the 270° meridian was explored by a cumulative frequency-of-seeing method. The green zone was found to fall in a narrower range and to end closer to the fovea than the red zone. Significant variations of peripheral sensitivity to red were found with all observers. For both red and green, the greatest number of irregularities were found in those curves which extended well into the periphery.