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AS, AD, and AU are the medical abbreviations for left ear, right ear, and both ears.
It may look a bit daunting, but understanding your eyeglasses prescription is easier than you might have thought. The two most important of these mystery terms and abbreviations are OD (Oculus Dextrus) and OS (Oculus Sinister). These are Latin terms that mean right eye and left eye, respectively. Listed after these OD and OS abbreviations are numbers preceded by either a plus sign (+) or a minus sign (-).