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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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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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More than 4.4billion prescriptions were dispensed within the United States in 2016.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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