Colour blindness UK
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Colour blindness, more accurately called colour vision deficiency, is a condition where the eye’s ability to distinguish between certain colours is reduced or absent. It affects roughly 8% of men and around 0.5% of women of Northern European descent, with the significant gender difference explained by the fact that the most common forms are inherited via a recessive gene on the X chromosome. Because men have only one X chromosome, a single faulty copy is enough to cause the condition, while women need two affected copies, making it far less common in females.
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