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In ophthalmic prescriptions, the abbreviation O.S. denotes which eye?

Right eye

Left eye

Eye designations on ophthalmic prescriptions use Latin terms. O.S. stands for Oculus Sinister, meaning the left eye. The right eye is Oculus Dexter, and both eyes are Oculus Uterque. So O.S. specifically indicates the left eye.

Both eyes

Neither eye

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