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190 bytes added ,  21:44, 11 February 2021
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OS is oculus sinister, or Latin for left eye.
BO is Base out, BI is Base in, BU is Base up and BD is Base down.
[[Pupillary Distance]] or PD, is the final set of numbers you need to be aware of. Most likely this is not listed on your "prescription" you will need to ask for it or measure it yourself.

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