Colour blindness test

Numéro d’image : 12050932
Colour blindness test
Colour blindness test. Plate 11 of an Ishihara test. Invented by Japanese physician Dr Shinobu Ishihara in 1917,the charts use arrangements of coloured dots to test for red-green colour blindness. In this plate those with normal vision will trace the green line between the two x's,but those with colour vision deficiencies are unable to follow the line,or follow a different one. The full test comprises 38 plates that test the type and severity of deficient colour vision. 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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Crédit: Science Photo Library
Taille de l’image : 4193 px × 4193 px
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Property Release : Non requis
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  • Not for diagnostic use

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