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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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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.