Color‐discrimination perimetry

Color‐discrimination perimetry was performed using Munsell color chips to determine how far from the fovea specific color differences would be just‐noticeably different. The results show that color‐discrimination limits were larger in the red‐to‐purple and the blue‐to‐green regions of the color circle than in the purple‐to‐blue, the green‐to‐yellow, and the yellow‐to‐red regions. Achromatic color‐discrimination limits went further into the periphery than did chromatic limits. We also performed color‐naming experiments at the fovea and in the periphery (30° nasal). Our results are reasonably well accounted for by the deuteranopic tendencies in the periphery of the retina.