Colour blindness test

Numéro d’image : 11849613
Colour blindness test
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 an image of an eye. 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
Licence : Droits gérés
Crédit: Science Photo Library / Nicholls, David
Taille de l’image : 4540 px × 4630 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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