Colour blindness test
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This is one of a series of diagrams exploring colour perception through visual illusions.
Visual illusions reveal anomalies in the way humans interpret the world.
Description
Colour Blindness Test
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About the diagram
The diagram above reproduces one of the Ishihara colour perception tests (https://en.wikipedia.org/wiki/Ishihara_tests ) that aim to establish whether a subject suffers from a type of colour blindness. These types of tests are sometimes called pseudo-isochromatic tests.
Each of the Ishihara tests depicts a disc of coloured dots that may appear to some as random in terms of both colour and size. But some of the dots form a numeral that is clearly visible to people with normal colour vision. The full series includes 38 diagrams but any difficulty distinguishing between colours is usually apparent after a few tests.
Some key terms
Diagrams are free to download
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