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Optometrists in the United States also are licensed to prescribe medications to treat certain eye problems and diseases. The scope of medical care that can be provided by optometrists is determined by state law.
A medical doctor (also rarely called allopathic medicine) does what an optometrist can do, as well as perform eye surgery and more advanced levels of treatment. O.D. on the prescription for eyeglasses, contact lenses, or medicine means oculus dexter, which is Latin for right eye. O.S. = oculus sinister , left eye.