Color vision deficiency and Vision defect

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

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

Vision defect noun - Impairment of the sense of sight.

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