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Snip summary	Colour blindness is caused because one of the three type... totally or partially absent. The most common for ... blindness which means that red and green colours ... are about 20 times lower for females as most for ... ... online! As others see - Colour blindness? http://www.hcibook.com/e3/online/colour-blindness/

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Full snip	Colour blindness is caused because one of the three types of rods is totally or partially absent. The most common form is red-green colour blindness which means that red and green colours look the same. The chances are about 20 times lower for females as most forms of colour blindness are inherited and recessive (women may be carriers of the gene without exhibiting it).