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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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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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There are 20 feet of blood vessels in each square inch of human skin.
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People about to have surgery must tell their health care providers about all supplements they take.