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Did you know?
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.
Did you know?
There are more sensory neurons in the tongue than in any other part of the body.
Did you know?
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
Did you know?
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.