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White light is a mix of light of different colors wavelengths or color we call spectrum red, orange, yellow,green, blue, indigo, and violet. About The Retina The retina contains up to 126 million microscopic light sensitive cells called rods and cones. Each one changes light energy into nerve signals. The 125 plus million rods detect low levels of light but can not distinguish color. Cones see color and details,but they only work in bright light.
Color blindness means that you have trouble seeing red, green, or blue or a mix of these colors. It’s rare that a person sees no color at all. Color blindness is also called a color vision problem. A color vision problem can change your life. It makes it harder to learn and read, and you may not be able to have certain careers. But children and adults with color vision problems can learn to make up for their problems seeing color.
"Eye" world book Enyclopedia 2003 ED. May 15,2013
"Look At Your Body Sense" By, Steve Parker, Book Field, Conneticut, Cooper Beech Books,1996 http://www.webmd.com/eye-health/tc/color-blindness-topic-overview What is color blindness? Eye Health care, April 14,2011 credits Most color vision problems are inherited (genetic) and are present at birth.People usually have three types of cone cells in the eye. Each type senses either red, green, or blue light. You see color when your cone cells sense different amounts of these three basic colors. Most cone cells are found in the macula, which is the central part of the retina. What causes color blindness?