About one in every 12 males and one in every 200 females suffer from some form of colorblindness. But there are many different kinds of colorblindness.
In one common form, a person cannot tell the difference between yellow and pale green. In another common form, a person cannot tell red and green apart. These colors both appear as a kind of gray.
Some people are totally colorblind. To them, all colors appear as shades of black and white.
