
Therefore there is no constraint in having eye laser surgery if you are colour blind as it does not affect the condition - much like wearing contact lenses or glasses
Colour blindness is a reduced ability to see colours that others can see.
Colour blindness is normally inherited from your parents. There are three types of inherited colour blindness which can be tested for.
In the retina in your eyes you have two kinds of light cells: rod cells are active in low light and cones which are active in day light. There are three types of cones which contain different pigment which become active when they absorb light.
These cones are sensitive to red, blue and green colours. When the cones do not work properly or do not have the right combination your brain doesn't get the right signal about what colour you are seeing.