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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?
The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
Did you know?
More than 4.4billion prescriptions were dispensed within the United States in 2016.
Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.
Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.