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metal prints plate metal prints card metal prints ophthalmology metal prints medicine metal prints ishihara metal prints red-green metal prints protanopia metal prints protanomaly metal prints deuteranopia metal prints deuteranomaly metal prints eye metal prints vision metal prints sight metal prints ophthalmic metal prints deficiency metal prints

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Colour blindness test. Computer artwork of an Ishihara colour test card used to check for red- green colour blindness. The card is comprised of red and orange dots on a background of green dots. A person with normal vision will be able to see the word 'vision'. A person with red deficiency (protanopia) will only see the orange parts of the word, while those with green deficiency (deuteranopia) will only see the red parts of the word. Colour blindness is usually caused by an inherited genetic defect in the light-sensitive cells (cones) of the eye. Colour blindness can also be caused by optic injury or nerve diseases.

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