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How To Measure    Your Pupillary        distance (PD)

  1. Stand 8 in. away from a mirror.

  2. Hold a ruler against your brow.

  3. Close your right eye then align the ruler’s 0 mm with the center of your left pupil.

  4. Look straight then close your left eye and open your right eye.

  5. The mm line that lines up to the center of your right pupil is your PD.

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Average pupillary distance for an adult is between 48mm-73mm. The range for children is approximately 41-55mm.

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