Abstract

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

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