![]() When one or more of these sensors (called cone photoreceptors) are defective or missing, colour blindness occurs. ![]() In the back of our eyes, we have three types of colour sensors which detect Red, Green and Blue light. Anyone who notices a change in their colour perception should present to an eye health professional for a comprehensive eye exam including a colour blind test. Red-green colour blindness is the most common form, and the defective gene is called on the X chromosome hence it is passed on from the mother.Ĭertain eye diseases such as optic neuritis, and particular medications such as hydroxychloroquine (Plaquenil) can cause acquired colour blindness, but these are rare. ![]() 1 in 12 males and 1 in 200 females suffer from some form of colour blindness. Most cases of colour blindness are inherited, and affects boys more than girls. It can be diagnosed by a simple colour blind test by an optometrist. Sufferers may have trouble distinguishing between certain colours such as Greens and Reds, especially if they are of the same brightness. Colour Blindness – or more accurately Colour Vision Deficiency (CVD) – is the inability to see colours accurately.
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