爱上海后花园

about ten men in every hundred

About ten men in every hundred suffer from colour blindness in some way;women are luckier only about one in two hundred is affected in this manner.There are different forms of colour blindness.A man may not be able to see deep red.

He may think that red orange and yellow are all shades of green.Sometimes a person cannot tell the difference between blue and green.In rare cases an unlucky man may see everything in shades of green-a strange world indeed.

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