During color blindness tests, test administrators show patients multiple cards with dotted patterns, and patients must identify the number or symbol on the card, according to MedlinePlus. The cards generally contain prim... More »

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The inability of the cone cells in the retina to correctly detect one or more of the red, green or blue light spectra is called color blindness, according to the American Academy of Opthamology. Lack of color distinction... More »

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Colorblindness is a recessive trait and is only carried on the X chromosome. Colorblindness occurs with a much greater frequency in men than in women because men only need a single copy of the gene to be colorblind, wher... More »

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The Ishihara 38-plate test is the standard diagnostic tool for detecting color blindness. The test contains 38 circles with patterns created by sets of irregularly shaped dots in two or more colors. The Farnsworth Lanter... More »

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Several online versions of the Ishihara test for color blindness exist, but it's best to take the test in a controlled environment such as a doctor's office. The test consists of 24 slides with a collection of differentl... More »

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There are a number of online tests available to identify if a person is color blind. Tests are offered by the Colorblind Home Page, Colblindor, EnChroma and more. More »

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Doctors most commonly test children for color blindness using the Ishihara Color Test, which involves a series of circles formed out of different-colored dots, explains the National Eye Institute. The dots form shapes in... More »

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