Colour vision deficiency and Dichromasy

Colour vision deficiency noun - Genetic inability to distinguish differences in hue.

Dichromasy and colour vision deficiency are semantically related. In some cases you can replace term "Dichromasy" with "Colour vision deficiency", this terms are similar.

Dichromasy noun - 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).

Colour vision deficiency and dichromasy are semantically related. You can use "Colour vision deficiency" instead a noun "Dichromasy".