Color blindness and Vision defect

Color blindness noun - Genetic inability to distinguish differences in hue.

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

Vision defect noun - Impairment of the sense of sight.

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