How to Measure Your Pupillary Distance (PD)

Are you ready to save big by ordering prescription glasses online at AndGlasses? Order glasses online is simple, first you’ll need to find your pupillary distance before you place your order. Although you may not see your Pupillary Distance (PD) measurement in your prescription, your licensed Eye doctor/optician will most likely have taken this measurement at the time of your eye exam. 


Pupillary Distance (PD) refers to the distance in millimeters between the pupils of your eyes. Having a correct PD on your glasses prescription insures that you are looking through the ideal spot in your lenses. PD measurement is important to insure your eyes match up with the optical center of your lenses.


You can follow the guide below to measure your PD with a millimeter (mm) ruler at home.


1.  Stand about 8 in. (20cm) away from the mirror

2.  Place a millimeter ruler up against your eyes, put it on the bridge of your nose

3.  Close your right eye, line up the starting point (0 mm) to the center of your left pupil. This measurement is only accurate if you are looking straight ahead

4.  While looking straight,  close your left eye and open the right eye

5.  Read the  mm mark on the ruler that  lined up with  the center of the right  pupil, this number is your distance PD

6.  You also can have a friend read the ruler. Have your friend face you about arms length away and make sure your friend must be at the same height as you

7.  Repeat these steps 2 or 3 times to make sure your results are accurate and consistent


As a guideline:

  • *Range of adult PD:  54-73.
  • *Range of child PD:  43-53.


If you don’t have a ruler, If you don’t have one, you can download a printable ruler by clicking here (PDF)Adobe Reader Download


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