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it is important for everyone to keep good eyesight. but do you know how to protect your eyesight?first, don't keep your eyes working for a long time. you'd better have a rest by looking in the long distance after you have studied an hour or so.
second, pay attention to the following: don't read in the sun or in a poor light; don't read in bed or in a moving bus. and when you read you should keep the book away from your eyes for about a foot.and third, do eye-exercises every day. it will also help you keep good eyesight.
if you obey the rules above, i think, you may prevent your eyesight from becoming short-sighted.