Definition of OD (lens prescription)
OD (lens prescription): Abbreviation of "oculus dexter." Latin for "right eye." (The words "dexterity" and "dextrous" derive from "dexter" since the right hand is usually more skillful than the left.)
OS stands for "oculus sinister" which is Latin for left eye.
Last Editorial Review: 10/9/2012
Back to MedTerms online medical dictionary A-Z List
Need help identifying pills and medications?