What colours do colour-blind people see?
The human eye is a sensitive camera which normally produces coloured pictures for us. But sometimes this camera is unable to distinguish between certain colours. And people who cannot see all the colours of the visual spectrum are called colour blind.
About one in every 12 males and one in every 200 females suffer from this defect. Colour blindness is a great handicap. It is particularly so for those who drive vehicles on the road. Driving can be dangerous for them because they cannot distinguish between red and green signals. Colour blind people are not given a job as pilots or engine-drivers for the same reason.
There are different kinds of colour blindedness. In the most common form, a person cannot tell the different between yellow and pale green. In another common one, a person cannot distinguish fed from green. To him both the colours appear a kind of gray. Some people are totally colourblind. To them, all colours appear as shades of black and white.
Colour blindness is considered a hereditary disease, and until now no cure has been found for this.