47+ What Does Od And Os Mean On A Glasses Prescription Pics. They are abbreviations for oculus dexter and oculus sinister, which are latin terms for right eye and left eye. What does 'base' mean on an eye prescription?
Looking at a glasses prescription can feel like you're reading another language. Anyone wondering how bad their eye prescription is can look at the numbers and notes on their prescription. Sph, cyl, axis, add and pupillary distance (pd).
But what do all those numbers on your eyeglass prescription mean?
Step one of understanding the prescription from your eye doctor is knowing od and os. If you don't need bifocals, you don't need this part of the the prescription. Webmd helps you understand your eyeglass prescription. Os (oculus sinister) means the left eye and od (oculus dextrus) means the right eye.