Acquired Color Blindness
Acquired color blindness, unlike congenital or inborn color blindness, is color blindness that is acquired later in life as a result of an accident or injury to the optic nerve. This damage can be due to toxic drug reactions, vascular diseases, or metabolic diseases. Normal color vision is the result of the cones (color photoreceptors) of the eyes correctly identifying red, blue, and green light. Color blindness is the result of a lack or partial lack of those photoreceptors.