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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.
Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
The average adult has about 21 square feet of skin.

