Color blindness is the inability to distinguish particular colors. It is generally an inherited
trait, but can result from a chemical imbalance or eye injury.
There are three primary colors. They are red, blue, and yellow. All other colors are the
results of different combinations of primary colors. Special visual cells, called cones, are respon-
sible for our ability to see color. People with normal vision have three different types of cones,
each responsible for a different primary color.
The absence of particular cones causes the absence of particular colors. …
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