PD (pupillary distance)

Why you need it

Your pupillary distance (PD) is the distance between your pupils. It is measured in millimeters (mm) and is usually between 50 and 70 for adults. The PD is needed to ensure that your vision is as clear as possible through your prescription glasses. Without the correct measurement, your vision through your glasses could be blurred, distorted or uncomfortable. Having the correct PD measurement gets more and more important the stronger your prescription gets.

How to get it

  • It could be printed on your prescription. If it is, you're lucky! Your PD is not required to be printed on your prescription.
  • You could go to an optical or optometrists office and get it measured. There is usually a fee charged for this service.
  • You can attempt to measure it yourself by following these steps:
    1. Position yourself arm’s length from your friend or yourself approximately 8 inches (20cm) away from a mirror.
    2. Close your left eye and align the 0 mm over the center of your right pupil.
    3. Close your right eye and note the reading directly over your left pupil. That will be your PD.
  • Take a picture of yourself and let us measure it by following these steps:
    1. Take off any glasses or face coverings and make sure you're in a well-lit area with a clean background
    2. Position your camera so that it's straight on and your face is centered. Look directly at the camera.
    3. Place any card with a magnetic strip under your nose and snap a photo. Make sure the card is touching your face, with the strip facing the camera.