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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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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.