If you were colour blind you wouldn’t see everything in black and white!

The most common type of colour blindness is when someone can’t see the difference between red and green. So in reality, they are not blind to all colours at all!

Why are some people colour blind?

It’s all to do with some special cells in your eyes called ‘Cones’. These are what detect colours so you can see what things look like.

You have 3 types of cone cells: red, blue and yellow.

Each one of these sees the colour it’s named after and the work together to let your brain see any colour imaginable!

Someone is colour blind when they have too many or not enough of these cone cells.

> Visit Professor Hallux’s i-Guide homepage
> Download the free i-Guide podcast from iTunes