Colour deficiency (also called colour blindness)is a result of a disorder in which:

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Colour deficiency (colour blindness) occurs when one type of cone in the retina is missing or not functioning properly. This results in an inability to distinguish certain colours or shades. Rods are responsible for vision in low-light conditions and the blind spot is a normal feature of the visual field. Trauma to area VI (the primary visual cortex) may result in visual impairments but is not directly related to colour deficiency.

Colour Deficiency (Also Called Colour Blindness)is a Result of a Disorder