What is my pupillary distance (PD)?
Your PD is the distance from the center of the pupil (black spot) in one eye to the center of the pupil in your other eye. Your PD measurement improves the positioning of your lenses within the eyeglass frame. Your PD has nothing to do with the eyeglass frame itself. Be sure you ask for your PD measurement when you have your eyes examined and have it added to your prescription. Wherever you had your last pair of eyeglasses made they will have your PD.
The PD in this example is 58 millimeters. We recommend you get your PD measurement with your prescription or have your local optician measure it for you. You can also get your PD from the last place your eyeglasses were made or for a small fee most optical shops will measure your PD.
Measure Your Own P.D. (Pupil Distance)
To measure your own P.D. simply put on a pair of eyeglasses and have a helper use a NON-PERMANENT marker and mark a dot in the center of each pupil on your eyeglasses.
Measure the distance between the dots in millimeters, thats all there is to it. A helper can also measure your P.D. standing an arms length away and hold the millimeter ruler's '0' value
to the left pupil (center) and measure straight across to the right pupil (center). Be sure to keep the ruler straight and measure in millimeters.