Color isn't just a component of vision. We associate color with beauty, like in a gorgeous sunset. Some colors have meaning in and of themselves: purple is for royals, red signifies passion...
Colors seep into our expressions: If we're depressed, we say we're feeling blue. We're also ‘green with envy’, we ‘see red’ and we might go ‘white with fear".
Colors even have practical meaning: red means stop, green means go. Certain colors are said to help you sleep, while others make you hungry.
And never underestimate the effect of a bright red dress. Color is important.
-Katie Lambert, HowStuffWorks.com
The term color blindness is actually an inaccurate term for color deficiency. There is no actual "blindness" involved - it's more a sort of color confusion, and color blind people do not see in black and white, except in some very rare and extreme cases. Due to color deficiency commonly being referred to as color blindness, ChromaGen uses both terms.
It is estimated that one-out-of-ten men and one-out-of-two hundred women are color deficient.