Colour-blindness

A person with colour blindness has trouble seeing red, green, blue or mixtures of these colours. The most common type is red-green colour-blindness, where red & green are seen as the same colour. Approx 1 in 12 males and 1 in 200 females have some form of colour vision deficiency.

Images copied from Colour Matters website
(The results of this test are not to be considered a valid medical test for color blindness and merely serve to illustrate the tests available.)






Top left:
Those with normal color vision should read the number 74.
Top right:
Those with normal color vision should read the number 6.
Bottom left:
Those with normal color vision should read the number 29.
Those with red-green deficiencies read the number 70.
Those with total color-blindness can not read any number.
Bottom right:
Those with normal color vision should not be able to read any number.
Most of those with red-green deficiencies should read the number 5.
Those with total color blindness can not read any number.