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If your prescription does not contain your PD: 1  Ask to have it measured at an optical shop â some may charge a fee. 2  Contact an optical shop where you have previously purchased prescription glasses. 3  Your previous optometrist may have a record of your PD.  Alternatively, try measuring your own Pupillary Distance as explained below.
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.