Abstract
Congenital red-green colour deficiency is an X-linked inherited disorder more frequently encountered in males compared to females. Screening of coour deficiency is crucial in various occupations, at times to safeguard colour deficient individual as well as vulnerable population. Acquired colour deficiency is seen in multiple inherited retinal photopigment disorders, vascular retonopathies and optic nerve disorders. Multiple tests have been devised to detect, classify and grade colour deficiency, each having a specific purpose. Tinted spectacles and contact lenses have been tried to rehabilitate colour deficient individuals with limited success.
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