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Color vision test
Alternative namesEye test - color; Vision test - color; Ishihara color vision test
DefinitionA color vision test checks your ability to distinguish between different colors.
How the test is performed
Your health care provider will ask you to sit in a comfortable position, and the test will be explained to you. You will be shown several symbols made of colored dot patterns. These dot patterns are on a background of randomly mixed colors.
You will be asked to identify the symbols, if possible.
How to prepare for the test
If your child is to have this test performed, it may be helpful to explain how the test will feel, and even practice or demonstrate on a doll. The more familiar your child is with what will happen and why, the less anxiety he or she will feel.
With small children, distinguishing a red bottle cap from caps of a different color may be the test.
How the test will feelThe test is similar to a vision test.
Why the test is performed
By using these plates, your health care provider can detect, classify, and estimate the degree of defect in your color vision.
In some circumstances, color vision testing is used to evaluate the function of the optic nerve. The optic nerve is the main nerve connecting the eye to the brain.
Normal ValuesNormally all symbols are distinguished.
What abnormal results meanThis test can determine the following abnormalities:
What the risks areThere are no risks associated with this test.
Update Date: 7/21/2003Edward B. Feinberg, M. D., Professor and Chair, Ophthalmology, Boston University School of Medicine, Boston, MA. Review provided by VeriMed Healthcare Network.
Last updated: Tue, 06 Jan 2009 00:20:03 GMT