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All About PD

What is a PD?

Your pupillary distance, or PD, is the distance between the centers of your pupils in millimeters (mm). This measurement is necessary to ensure the correct positioning of your lenses within the frame you have chosen.

To measure your Pupillary Distance (PD):
  • Place a millimeter ruler on the bridge of your nose.
  • Have a friend face you about arms length away.
  • Have your friend measure the distance between the centers of your pupils (the black dots in the middle of your eyes).
  • Or you can do it yourself simply by looking in the mirror. If you need your glasses on to do this, you can draw dots on the lenses where your pupils are (using a magic marker or highlighter); then take the glasses off and measure the distance between them.
It's simple -- like playing connect the dots!

You can also get this information from your doctor or from a licensed optician.

As a guideline:
    • Most adults' PD's are between 55-65.
    • Most kids' PD's are between 42-54.

If you had your PD measured by an eye care professional, it is possible they gave you more than one number. If they gave you two numbers and they are exactly the same (for example 31.5/31.5), you can just add them up and use that as the PD number. If they are not same they should be used as provided. If you are interested to know why you have more than one number, below is a brief explanation.

If the numbers are higher (and different), like 62/59, then the first number is your Distance PD and the second is your Near PD (for reading-only glasses).

If the two numbers are lower (and different), like 30.5/31.5, then you had someone take your PD one eye at a time (called "monocular PD").

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