Definition of OS (lens prescription)
OS (lens prescription): Abbreviation of "oculus sinister." Latin for "left eye."
By contrast, OD stands for "oculus dexter" which is Latin for the right eye.
Source: MedTerms™ Medical Dictionaryhttp://www.medterms.com/script/main/art.asp?articlekey=18953
Last Editorial Review: 10/9/2012
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