Q: I have no idea what a pd is , can I just order without whatever that is
A: Dear Rosemary,Pupillary Distance (PD), the distance between the centers of your pupils, determines where you look through the lens of your glasses. It should be as accurate as possible. The average adult\'s single PD is between 54-74 mm; kids\' are between 43-58 mm. The PD is very important to your vision. We need to make the lenses according to your PD.If you don\'t know your PD,
you have rights to contact your doctor/optometrist to get your accurate PD value, or you can download this APP to measure it: https://www.glassifyme.com/pd-meter-app/ .