Colour blindness and Red-blindness

Colour blindness noun - Genetic inability to distinguish differences in hue.

Red-blindness and colour blindness are semantically related. In some cases you can use "Red-blindness" instead a noun phrase "Colour blindness".

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

Colour blindness and red-blindness are semantically related. Sometimes you can replace phrase "Colour blindness" with "Red-blindness", this phrases are similar.