Learn about Color Vision in this educational video from dizzo95.
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Color vision is a synthesis of red, green and blue light which is brought about by changes in pigments within the cone cells of the retina. The human eye can recognize hundreds of different colors which are combinations of these three colors. It is believed that three specialized types of cones exist. One is responding to red light, one to green and one to blue light. Some of these cones however can be stimulated by the whole visual spectrum. The variable stimulation of all the cones can register all of the colors known to man. Absence of or defects in the cones that respond to red, blue or green light causes various types if color blindness. Color blind people may not be able to see green and red, blue and yellow, although blindness to blue is rare or any color at all with everything appearing gray.

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