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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?
Medication errors are three times higher among children and infants than with adults.
Did you know?
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
Did you know?
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.