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阅读三 About ten men in every hundred have the trouble of color blindness in some way. Women are luckier, only about one in two hundred is affected(感染) in this matter. Perhaps, after all, it is safer to be driven by a woman. There are different kinds of color blindness. For example, a man cannot see deep red. He may think that red, orange and yellow are all shades(影子) of green. Sometimes a person can't tell the difference between blue and green. Only a few unlucky men may see everything in shades of green-a strange world indeed. Color blindness in human beings is a difficult thing to explain. In only one eye there are millions of very small things called