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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 average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Did you know?
People about to have surgery must tell their health care providers about all supplements they take.
Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
Did you know?
The average adult has about 21 square feet of skin.