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People who are near-sighted can only look things that are very close to their eyes. Everything before their eyes seem unclear. Many people do a lot of close work, writing, reading and sewing become near-sighted. So they have to wear glass so as to see distance objects clearly. People who are far-sighted suffered from just the opposite problem. Although they can't see things that are far away, they have difficulty reading a book if they hold them at an arm's length. If they want to do many reading, they have to wear glasses, too. Other people do not see clearly because of their eyes aren't exactly of the right shape.