Colour blindness is often inherited, and present at birth.
How to spot it - Sufferers might find it difficult to distinguish between certain colours, for example, reds, oranges, yellows, greens and browns – most commonly, red and green appear the same. Colour-blind people may also struggle to tell the difference between paler and deeper shades.
Treatment - Colour blindness cannot be reversed, but filters on glasses or tinted contact lenses can enhance the ability to distinguish between some colours. Speak to an eye care professional about managing the condition.