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Definition of OD (lens prescription)

Medically reviewed by Min Clinic Staff | Updated: January 2026

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.