OS indicates which eye?

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Prepare for the Washington State Veterinary Medication Clerk Test. Study with detailed questions and answers, with practical hints and explanations to guide you. Ace your exam by practicing with our resources!

Multiple Choice

OS indicates which eye?

Explanation:
OS indicates the left eye. It comes from oculus sinister, where sinister means left. In ophthalmic terminology, OD is the right eye (oculus dexter) and OU is both eyes (oculus uterque). So seeing OS on a label tells you the medication is intended for the left eye; OD would be right eye, and OU would apply to both eyes. Left ear isn’t part of these eye abbreviations.

OS indicates the left eye. It comes from oculus sinister, where sinister means left. In ophthalmic terminology, OD is the right eye (oculus dexter) and OU is both eyes (oculus uterque). So seeing OS on a label tells you the medication is intended for the left eye; OD would be right eye, and OU would apply to both eyes. Left ear isn’t part of these eye abbreviations.

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