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Colour perception grades are as under: cp-1: correct answers to the series of colours with the smallest aperture of martin lantern test from a 6-meter distance. Cp-2: must pass ishihara book (colour perception test in which numbers are identified from the plate) with no error. Cp-3: person should be able to recognise the red, green and white colour signal from a distance of 1.5 metres. Cp-4: when a person is unable to distinguish 3 colours correctly. In army accepted level of cp is 3 and for navy and airforce 1.
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