Inherited color vision deficiency is usually diagnosed in early childhood using a simple screening tests. The Hardy-Rand-Rittler (H-R-R) and Ishihara Color Plates are used to evaluate the type and degree of color deficiency. In these tests, the person is asked to identify the colored shapes or numbers that lie within a jumble of dots and vary in color and intensity. The physician detects and categorizes the deficiency based on the person’s responses.
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| Hardy Rand Rittler test |
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| Ishihara test |
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