How to Measure Your Pupillary Distance (PD)

What is Pupillary Distane?

Pupillary distance (PD) measures the space between the pupils of your eyes. Knowing this measurement is important to make sure your eyes match up with the optical center of your lenses. The average adult’s PD is between 54-74; kids' are between 43-54.

How to Measure Your PD?

  • Stand 8 in. away from a mirror.
  • Hold a ruler against your brow.
  • Close your right eye then align the ruler’s  0 mm with the center of your left pupil.
  • Look straight then close your left eye and open your right eye.
  • The mm line that lines up to the center of your right pupil is your PD

?Why Is It Important

Every set of prescription lenses has an “optical center,” which is determined by pupillary distance.

Pupillary distance is used to determine where you look through the lens of your glasses and should be as accurate as possible

Measure The Distance

Your prescription may tell you your PD. But if the PD is not available, use your friend or a mirror to help you figure it out


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