Colour blindness is the inability to distinguish certain colours from one another. It involves some kind of difficulty in distinguishing colours, most commonly

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Red-green color blindness is the most common type of colour blindness, affecting about 8% of males and 0.5% of females of Northern European descent. This means that those affected have difficulty distinguishing between shades of red and green.

Colour Blindness Is the Inability to Distinguish Certain Colours from One