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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Medication errors are three times higher among children and infants than with adults.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.