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AS, AD, and AU are the medical abbreviations for left ear, right ear, and both ears.
Test Your Eye Health With Our Quick Assessment How to Read Your Eyeglass Prescription When you look at your prescription for eyeglasses, you will see numbers listed under the headings of OS and OD. They are Latin abbreviations: OS (oculus sinister) means the left eye and OD (oculus dextrus) means the right eye. Occasionally, you will see a notation for OU, which means something involving both eyes.