Noun: protanopia ,prow-tu'now-pee-u
- Dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue
"Protanopia affects about 1% of males";
- red-blindness
Derived forms: protanopias
Type of: red-green color blindness [US], red-green colour blindness [Brit, Cdn], red-green dichromacy
Encyclopedia: Protanopia