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

TRY SOME QUICK QUESTIONS AND ANSWERS TO GET STARTED
Yes! The human retina inside the eyeball has a light-sensitive layer of neurons on its surface?
The blind spot in the human eye corresponds with the point in the retina where the optic nerve exits and the central artery enters the eyeball.

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

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