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Colour Blind Test - Online Self Test


You may have heard of colour blindness but not really know exactly what it means. Find out everything you need to know about the causes, symptoms, tests and treatment for colour blindness.


What is Colour Blindness?

Colour blindness is a term for when someone is unable to see colours in a normal way. More accurately, it is a colour deficiency rather than colour blindness. Often, someone may not be able to distinguish between certain colours, most commonly between reds and greens and occasionally blues.


What Causes Colour Blindness?

In the retina of the eye, there are two types of cells, rods and cones, that detect light. Rods detect light and dark whereas cone cells detect colour. Cone cells are concentrated in the central area of the retina in the macula. There are blue, green and red cones and your brain uses input from these cone cells to determine your colour perception.

Colour blindness can occur when there is an abnormality in these colour cone cells. This could either be because there is an absence of cone cells, some of them may not be working correctly or some may detect a different colour than normal.

You usually suffer with colour blindness from birth and generally males are more affected than females. However, you can also acquire it later in life as a result of trauma, diseases including metabolic and vascular diseases, toxic effects from drugs and general aging.

If you experience a significant change in colour perception, you should visit an eye specialist.


Types of Colour Blindness

Severe colour blindness occurs when all three cone cells are absent, and this is known as achromatopsia.  In this case, you will see everything in different shades of gray! Mild colour blindness is when one cone cell does not work properly, and you may see colours normally in good light but struggle in dim light.


Colour Blind Symptoms

Symptoms can be so mild that you may not even realize that you have a colour deficiency! However, they can also be severe and include:

- Difficulty seeing colours and the brightness of colours

- Difficulty or inability to tell the difference between shades of the same or similar colours


Is There a Colour Blind Test I Can Take?

You can very easily do a colour blind test online without having to go to an eye specialist. This test, also known as the Ishihara test, is a fast and simple way to determine whether you struggle to perceive colour in a normal way. The test is made of a series of ‘plates’ of coloured dots. In the center, the coloured dots make up a number, and this number is surrounded by coloured dots of a different colour.  

Have a go! See the answers at the end of the article.



1)     Firstly, make sure you have the lights on. If you wear glasses of                    contact lenses, you can wear them to do the test.

2)     Look at the patterns made up of multi-coloured dots.

3)     If you can make out the numbers and shapes among the dots, you          do not have a colour deficiency.

4)     If you struggle to do this, you may have a colour deficiency and it is             advised that you visit an eye specialist for a more comprehensive               test.


If you are not sure about this test or if you would like more accurate results, visit an eye specialist to take a colour blind test administered by a trained professional using standardized testing materials under proper lighting.


For a colour blind test for kids, it is advised that you book an appointment with an eye specialist.


Is There a Treatment for Colour Blindness?


There is no treatment for inherited colour blindness but there are special contact lenses and glasses that may help to enhance colour perception.

If you have acquired colour blindness, an eye specialist may be able to address the underlying condition that caused the problem.

If your eye specialist recommends that you wear eyeglasses or contact lenses, Vision Direct has you covered!


You can also check the current prescription of your eyeglasses using Vision Direct's revolutionary Lens Scanner app. In just a few easy steps, you can extract your current prescription using just the app, your eyeglasses, a screen and a magnetic card. Do it from the comfort of your own home in a matter of minutes!


Answers from top left to bottom right: B, 26, 2, 14, 6, G


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