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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.