what's mean for the Latin words on your eyeglasses prescription

[online glasses]

Example:
OD: -75 -450x140
OS:-100 -450x108
ADD +200 OU
PD 66 mm
Latin abbreviations are often used in health care to write medical prescriptions (RX) and eyeglass prescriptions (RX). In fact, these abbreviations are becoming less and less common currently. The OD stands for "oculus dexter" and indicates the right eye. The OS means "oculus sinister" for left eye. The letters OU stand for "oculi uterque" and refer to both eyes.