How to sign: a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision)
Similiar / Same: dichromacy, dichromatopsia, dichromia, dichromasy
Categories: color blindness, color vision deficiency, colour blindness, colour vision deficiency
Within this category: red-green dichromacy, yellow-blue dichromacy