What Happens If Pupillary Distance Is Off?

PUPILLARY DISTANCE (PD) measures the distance between the centers of your pupils. This measurement is used to determine where you look through the lens of your glasses and should be as accurate as possible. The average adult’s PD is between 54-74 mm; kids’ are between 43-58 mm.

Does PD matter for glasses?

Before you order a pair of prescription glasses online, it’s essential to have your pupillary distance (or PD) measurement. … It centers your prescription in front of your pupils, for the clearest and most accurate vision with your new glasses. Inaccurate PD can cause unnecessary eye strain and headaches.

Is PD different for different frames?

?Does PD affect frame size? Your PD has no effect on the size of your eyeglass frame. The PD number influences the shape of your lenses, but not the frame.