At the back of the eye is a layer of cells called the retina. The retina is a network of nerves connected to 100 million rods and cones which work together to transform the image into electrical energy, sent to the optic disk on the retina and then along the optic nerve to the brain. The retina contains specialised cell types called photoreceptors. There are two types known as rods and cones.
Rods - are sensitive to light and dark changes, shape and movement and are responsible for vision at low light levels.
Cones - are sensitive to one of three colours (red, green or blue). They are active during higher light levels. Colour blindness occurs when one of these cones no longer senses colour.
"COLOR BLINDNESS MAY SOON BE TREATABLE WITH A SINGLE INJECTION"
"SPECIAL GLASSES GIVE PEOPLE SUPERHUMAN COLOUR VISION"
New Scientist - 21st March 2017
Daily Mail Online - 22nd March 2017
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Ishihara Testing for Colour Vision Deficiency