Pupillary distance (PD) is indicated on the inside of your glasses, but in a roundabout way. You’ve probably noticed three sets of numbers on the inside of your frames. In this order, they are:, eye size number (the size of your lenses on your frame), bridge size number (the distance between each lens), temple length number (size of the frames), To get your PD, add together the temple length number (frame size) with the bridge size number. For most brands, that will give you your PD. A word of caution, however – if you have to measure your PD to purchase online glasses, utilize the prescription tool provided by the seller. This is the only way to truly ensure accuracy.,