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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?
Cyanide works by making the human body unable to use oxygen.
Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
Did you know?
Approximately 25% of all reported medication errors result from some kind of name confusion.
Did you know?
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.