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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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Everyone has one nostril that is larger than the other.