How To Read An Eyeglass Prescription - The Optical World …
Jan 25, 2007 · The letters OD and OS in front of a prescription let us know which eye each string of numbers is for. OD(Oculus Dexter) stands for right eye and OS(Oculus Sinister) for left eye, while OU(Oculus Uterque, Oculus Unitas or Oculus Uniter) means both eyes. Sphere:This number measurement reflects the extent of the nearsightedness or farsightedness.
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