Red-green colour blindness is the most common type of colour blindness. It is sex- linked recessive disorder. The genes for red-green colour blindness are present on X chromosomes. They find it hard to differentiate between red and green colours. It is caused due to absence of specific colour receptors in the cones or due to altered sensitivity of colour receptors. There are four types of red-green colour blindness, namely protanomaly, deuteranomaly, protanopia and deuteranopia.
Deuteranomaly is the most common and mild type, here green looks more like red and is due to malfunctioning of the green sensitive cones. In protanomaly red sensitive receptors are defective and red looks more like green. In protanopia and deuteranopia, people fail to discriminate between red and green.
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