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