Protanopes and deuteranopes do not accept the classical dichromatic matches when field size extends to 8° visual angle. Their unique matches of spectral yellow to a mixture of red and green are then mediated by the photoreceptors of small-field dichromacy interacting with a photoreceptor with the spectral sensitivity of rhodopsin. Our data suggest that large-field trichromacy is a general feature of protanopia and deuteranopia.
© 1977 Optical Society of America
Vivianne C. Smith and Joel Pokorny, "Large-field trichromacy in protanopes and deuteranopes," J. Opt. Soc. Am. 67, 213-220 (1977)