How to Measure Pupillary Distance
What is PD?
PD is the distance between the centers of your pupils measured in millimeters. This measurement allows us to place the optical center of the lens directly in front of the pupils providing a more personalized fit unlike over-the-counter readers.
How to Measure
If your doctor did not provide your PD measurement on your prescription you can measure it yourself or have a friend measure it for you. You’ll need a small ruler marked in millimeters. If you are alone then stand about 8 inches from a mirror and measure from the center of one pupil to the center of the other. Write down your results and measure once or twice more just to be sure you get the same result.