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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?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
Medication errors are three times higher among children and infants than with adults.
Did you know?
More than 4.4billion prescriptions were dispensed within the United States in 2016.