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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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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The FDA recognizes 118 routes of administration.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.