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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Sonnet 16, also known as "On His Blindness," by John Milton finds the poet contemplating his usefulness to God in his present state of being blind. The sonnet was written after Milton lost his eyesight in 1652. More »

John Milton's "On His Blindness" is an English sonnet about a man who surrenders himself to the will of God. In it, Milton confesses that midway through his life, he has been rendered blind and suffers great personal gri... More »

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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