Colour blindness test

Colour blindness test

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Credit: ANNABELLA BLUESKY/SCIENCE PHOTO LIBRARY

Caption: Colour blindness test. Cards being used to check for red-green colour blindness. The Ishihara test, which uses pseudoisochromatic plates, is the most widely used. Each card depicts a number formed from red dots on a background of green dots, or vice-versa. People suffering from red-green colour blindness cannot distinguish the numbers. Colour blindness is usually caused by an inherited genetic defect in the light-sensitive pigments of the eye, but it can be caused by optic injury or nerve diseases. Up to 8% of the male population is affected, and ten times more men have colour blindness than women. The number seen here is 29.

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Keywords: cards, colour blindness test, daltonism, deficiency, deutanopia, deuteranomalia, deuteranopia, diagnosis, diagnostic, diagnostics, equipment, eye, eyes, healthcare, ishihara, medical, medicine, ophthalmic, ophthalmology, plates, protanomalia, protanopia, pseudoisochromatic, red-green, technique, vision

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