Colour blindness and Visual impairment

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

Visual impairment and colour blindness are semantically related. In some cases you can use "Visual impairment" instead a noun phrase "Colour blindness".

Visual impairment noun - Impairment of the sense of sight.

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