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People with colour blindness can't see colours in a normal
way. Colour blindness{#blank#}1{#/blank#}(affect) approximately 1 in 12 men and
1 in 200 women in the world.
There are various
causes of colour blindness. For the majority of colour-blind people, the
condition is something they have from {#blank#}2{#/blank#}(bear), although some people get it
later in life because of diseases.
Most colour-blind people can see things as clearly as other
people, but {#blank#}3{#/blank#} are unable to fully "see" red, green
or blue light. There are different types of colour blindness and there are
extremely rare cases {#blank#}4{#/blank#} people are unable to see any colour at all.
The {#blank#}5{#/blank#}(common) form of colour blindness is
red/green colour blindness. Although {#blank#}6{#/blank#} (know) as red/green colour blindness, the form
of colour blindness doesn't mean sufferers {#blank#}7{#/blank#} (mere) mix up red and green. It means they mix
up all {#blank#}8{#/blank#} (colour) that have some red or green as part
of the whole colour.
The effects{#blank#}9{#/blank#}colour blindness can be mild, moderate
(中等的) or severe. Approximately 40% of
colour blind people are even unaware that they're colour blind. Statistically{#blank#}10{#/blank#}(speak), most people with a moderate
form of red/green colour blindness can only identify 5 coloured pencils from a
standard box of 24 pencil crayons.