Color vision deficiency and Visual defect

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

Visual defect and color vision deficiency are semantically related. In some cases you can use "Visual defect" instead a noun phrase "Color vision deficiency".

Visual defect noun - Impairment of the sense of sight.

Color vision deficiency and visual defect are semantically related. Sometimes you can replace phrase "Color vision deficiency" with "Visual defect", this phrases are similar.