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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.
On average, the stomach produces 2 L of hydrochloric acid per day.
More than 4.4billion prescriptions were dispensed within the United States in 2016.
All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.