Dimmed bright colors: Protanopes lack long-wavelength-sensitive cones & are unable to distinguish between colors in the green–yellow–red part of the spectrum. Also the brightness of red, orange, & yellow is much reduced. Deuteranopes lack medium-wavelength cones; they have the same hue discrimination problems as the protanope, but without the abnormal dimming. Both have red-green colorblindness.
Answered 2/9/2021
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