This image is not available for purchase in your country.

Colour blindness test

Colour blindness test

M450/0243

Rights Managed

This image is not available for purchase in your country.

Please contact your Account Manager if you have any query.

Credit

ANNABELLA BLUESKY / SCIENCE PHOTO LIBRARY ANNABELLA BLUESKY / SCIENCE PHOTO LIBRARY

Caption

Colour blindness test. Cards that are used to check for red-green colour blindness. The Ishihara test, which uses pseudoisochromatic plates, is the most widely used. These cards depict numbers formed from red dots on a background of green dots. 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 numbers seen here are 29 (left) and 57 (right).

Release details

Model release not required. Property release not required.

 {{ i.shot_duration ? i.shot_duration + ' ' : '' }}{{ i.shot_uhd ? '4K ' : i.hires ? 'HD ' : '' }}{{ i.spl_number }} R{{ i.license }}

  • Add to board
  • Similar {{ mediaType(i) }}