Color vision deficiency and Monochromacy

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

Monochromacy and color vision deficiency are semantically related. In some cases you can replace term "Monochromacy" with "Color vision deficiency", this terms are similar.

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

Color vision deficiency and monochromacy are semantically related. You can use "Color vision deficiency" instead a noun "Monochromacy".