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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.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=18952
Last Editorial Review: 10/9/2012

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