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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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People about to have surgery must tell their health care providers about all supplements they take.
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There are 20 feet of blood vessels in each square inch of human skin.
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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.