What is colour blindness
Types of colour blindness
There are three types of colour blindness.
Red–green colour blindness
Red-green colour blindness is the most common form of colour blindness. It is usually inherited and mostly affects males. It means you find it hard to tell reds from greens.
Blue–yellow colour blindness
Blue-yellow colour blindness is less common than red-green colour blindness. It means you find it hard to tell blues from yellows.
Complete colour blindness
If you have this, you don’t experience colour at all. Complete colour blindness is extremely rare.
Colour blindness diagnosis
Your doctor or optometrist can check you for colour blindness. The most common way is with Ishihara cards, a colour-vision test. There is also the newer Cambridge Colour Test.
How does colour blindness affect daily life?
It might cause you some problems, but others you will learn to overcome.
For example, if you have red-green colour blindness, you might have trouble telling if red meat is cooked.
And you might have trouble seeing the colours on traffic lights. But you can learn that the red is at the top and the green is at the bottom.
Children with colour blindness might need help with schoolwork as educational materials are often colour-coded.
If you are colour blind, some occupations will be difficult. These include being a pilot, long distance driving or work where colours are important, like graphic design.
If you’re concerned about colour blindness, see an optometrist. Your doctor can also refer you to an ophthalmologist (eye specialist). They can recommend ways to manage colour blindness, with thing like special lenses or software.
Last reviewed: March 2016