A person with color deficiency may not be able to see the number 5 among the dots in this picture.

The test consists of showing you a pattern made up of multi-colored dots. If you do not have a color deficiency, you will be able to see numbers and shapes among the dots. If you are color blind, you will have a hard time finding the number or shape in the pattern or you may not see anything in the pattern at all.

There is no treatment for congenital color blindness. It usually does not cause any significant disability. However, there are special contact lenses and glasses that may help people with color blindness tell the difference between similar colors.

Acquired forms of color blindness may be treated by addressing the underlying condition or drug that caused the problem.

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