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Colour blindness is a visual disorder where sufferers are unable to distinguish between certain colours (often red and green).
Colour Vision Daltonism, colour blindness
Colour vision deficiency is a problem that involves the retina, or more specifically, the cells within the retina. Located at the back of the eye, the retina is made up of two types of cells known as rods and cones. Rods are light-sensitive structures that provide night and low light vision. They are not associated with colour differentiation. That role is up to the cones. There are three types of cones and each is responsible for red, green or blue colour pigments. These so called "primary colours" allow us to see every other colour. If the cones that are associated with a colour are absent or not functioning properly, the affected person will have difficulty distinguishing certain colours.
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