What does PD stand for? PD stands for pupillary distance. What does this mean? Your PD is the distance between the centers of each pupil. This is a necessary measurement because it ensures the correct position of your lenses within the frame you have chosen. How to measure your PD: 1. Download and print our PD ruler by clicking here. NOTE: Do not “Resize” or “Shrink to Fit” on your printer settings. The ruler should be printed at actual size for the most accuracy. 2. Cut the ruler template along the solid outer line and fold along the dotted line. 3. Place the ruler on the bridge of your nose and…