Question:

What does O.D. and O.S. on my contact lens prescription mean?

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It says

O.D. - Sph. -1.25

O.S. - Sph. - 1.00

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  1. O. S. stands for "oculus sinister", which is Latin for "left eye".

    O. D. stands for "oculus dexter", which is Latin for "right eye".

    Sph. stands for "spherical lens".

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