• The easiest way is to have a friend or family member help you.
  • Use a non-permanent marker.
  • Put on a pair of glasses.
  • While looking straight ahead, have your assistant place a dot right in front of your pupil on each lens.
  • Using a MM ruler measure from one dot to the other.
  • Most adult PD’s are between 60 and 65mm.┬áThe average being 63. Adults with a wider face and eyes that are farther apart will have a bigger PD.
  • From the dot to the bottom of the frame is your SEG HT.
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