PERHAPS you ve been having trouble seeing the black-<br >board or the television screen clearly. Or the print<br >looks blurry when you try to read a book. Maybe<br >people have been noticing that you tend to rub your<br >eyes or squint a lot. Or perhaps you thought every-<br >thing was fine， but you couldn t read all the letters on<br >the 20/20 line of the eye chart in a routine physical<br >exam. And now the doctor says you need glasses.<br > Or perhaps you re just curious. Maybe a friend<br >recently started wearing glasses， and you re wondering<br >what is wrong and how the glasses can help. Perhaps<br >your mother just got a prescription for reading glasses，<br >after a few years of asking you to thread needles for<br >
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