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How to Determine Your Pupillary Distance (PD)

While you can measure your pupillary distance (PD) yourself using a mirror, we recommend enlisting the help of a friend or family member if possible

  1. Stand 8 inches (20 cm) away from the mirror or a friend.
  2. Face the mirror straight on and hold the ruler just below your eyes.
  3. Close your left eye and align the ruler's zero to the center of your right pupil.
  4. While keeping your gaze straight ahead, close your right eye and open your left eye.
  5. Read the millimeter line directly over the center of your left pupil – this is your PD.
  6. Repeat these steps 3 or 4 times to ensure accuracy.ce.
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