Colour vision deficiency (colour blindness)

The main tests for colour vision deficiency include the Ishihara test and colour arrangement tests.

Colour vision deficiency can run in families. It can also be caused by medical conditions or certain medicines.

There is no treatment for colour vision deficiency that runs in families, but people usually adapt to living with it.

Colour vision deficiency (colour blindness) is where you have difficulty telling the difference between colours.