## Extra

Colour blindness

Some people think all people who are colour blind can't see colours. This is not true. People with colour blindness usually have problems with seeing the difference between two colours. In some rare cases they can't see any colour.

Most people who are colour blind only find out later in life. People who are red-green colour blind usually think that is what red and green are surposed to look like!

So how do you find out?

Do the test below:

http://enchroma.com/test-150401.2/#&ui-state=dialog