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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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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Excessive alcohol use costs the country approximately $235 billion every year.