Colour vision deficiency and Monochromia

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

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

Monochromia noun - Complete color blindness; colors can be differentiated only on the basis of brightness.

Colour vision deficiency and monochromia are semantically related. You can use "Colour vision deficiency" instead a noun "Monochromia".