Color blindness and Visual defect

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

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

Visual defect noun - Impairment of the sense of sight.

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