Color vision deficiency and Monochromatic vision

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

Monochromatic vision and color vision deficiency are semantically related. In some cases you can replace phrase "Monochromatic vision" with "Color vision deficiency", this phrases are similar.

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

Color vision deficiency and monochromatic vision are semantically related. You can use "Color vision deficiency" instead a noun phrase "Monochromatic vision".