Congenital defect and Colour vision deficiency

Congenital defect noun - A defect that is present at birth.

Colour vision deficiency and congenital defect are semantically related. In some cases you can replace phrase "Colour vision deficiency" with "Congenital defect", this phrases are similar.

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

Congenital defect and colour vision deficiency are semantically related. You can use "Congenital defect" instead a noun phrase "Colour vision deficiency".