Protanopia and Red-blindness

Protanopia noun - Dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue.

Red-blindness is a synonym for protanopia. In some cases you can use "Red-blindness" instead a noun "Protanopia".

Red-blindness noun - Dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue.

Protanopia is a synonym for red-blindness. You can use "Protanopia" instead a noun phrase "Red-blindness".