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It is shorthand used by ophthalmologists in eyeglass prescriptions. I am not sure if this qualifies as Latin; we classify per os found in medical prescriptions as translingual. For the rest, now we have to find three durably archived eyeglass prescriptions :). --Lambiam08:05, 16 April 2020 (UTC)Reply
per os does occur in English and German, so technically it's used translingually. In Latin however, it's SOP (peros).
As for the uses, they are English OS/O.S. & OD/O.D.. And here are mentions of German OS/O. S. & OD/O. D. as well as of German LA & RA: , . So there might indeed be Translingual OS & OD. However, that does not make it a Latin term and does not attest a Latin term.
