Most people who begin wearing glasses or contacts when they are young have one of three common vision problems: Myopia (nearsightedness), hyperopia (farsightedness), or astigmatism. All of these are called refractive errors rather than eye diseases. Longsightedness and shortsightedness are much more common if one of the parents already has one of them. Aside from that, children born prematurely and underweight at birth are more likely to develop shortsightedness. Both long and shortsightedness account for the vast majority of people who wear glasses around the world. So, what is shortsightedness and longsightedness, and how to recognize that a person has any of
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