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Colour blindness Test

Colour blindness is a visual anomaly, often of genetic origin, that disturbs the perception of certain colours, mainly green, red, and blue. Symptoms of colour blindness include a tendency to confuse colours, particularly red and green. This difference sometimes goes completely unnoticed! Are you in doubt? This colour blindness test will allow you to assess your own colour perception. 

Test explanation

This test, also known as the Ishihara test, is one of the most widely used colour blindness tests in the profession. Surprisingly, colour blindness is often diagnosed late. A colour-blind person lives with their own colour references on a daily basis and does not necessarily realise that these references are not the same as those of other people. 

To perform this test online, stay at a normal distance from the screen. Be sure to set your display settings (brightness and contrast) to automatic. 

Two coloured mosaics are displayed on the screen. For the test, you simply need to observe them. 

The one on the left is predominantly green and the one on the right is predominantly red. The number 45 stands out in red in the centre of the mosaic on the left. The number 73 stands out in green in the centre of the mosaic on the right. 

If the colours on your screen cause you any doubt, do not hesitate to print out the test and do the exercise on paper. 

Test results

What do your results mean?

An unusual property of the cells of the retina causes confusion between colours. This test could suggest possible colour blindness. 

Although there are several types of colour blindness, the most common kind causes confusion between red and green. Therefore, if you cannot read the two numbers on these green and red mosaics, you may suffer from this visual defect. 

There is also a rarer form of colour blindness called “monochromatism”, which causes people to see life in black and white.