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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 the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.