The human eye sees when light stimulates the sensitive cells on the retina. The retina is made up of ‘rods’ and ‘cones’. The rods, located in the peripheral retina, give us the ability to see in the dark, but cannot distinguish between colours.
The cones in the retina are responsible for most of our acute colour vision.
Colour blindness is a genetic condition caused by a difference in how one or more of the light-sensitive cells found in the retina of the eye respond to certain colours. These cells, called cones, sense wavelengths of light, and enable the retina to distinguish between colours.
With this vision problem, colour-blind individuals have difficulty distinguishing between certain colours, such as blue and yellow, or red and green. There is no cure for colour blindness. Most people are, however, able to adapt to colour vision deficiencies without too much trouble.
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