Noun
dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue
Source: WordNetEpidemiology Color blindness affects a large number of individuals, with protanopia and deuteranopia being the most common types. Source: Internet
Conventional color coding is difficult for individuals with red-green color blindness (protanopia or deuteranopia) to discriminate. Source: Internet
It affects hue discrimination in the same way as protanopia, but without the dimming effect. Source: Internet
People who have, for instance, both protanopia and tritanopia are considered to have cone monochromacy. Source: Internet
The difference with protanopia is that in this case the L-cone is present but malfunctioning, whereas in the earlier the L-cone is completely missing. Source: Internet