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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 Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=18953
Last Editorial Review: 10/9/2012

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