Pupillary Distance (PD) Help - Measuring your PD

Your PD is the distance between each of your pupils. This measurement is necessary to ensure the correct positioning of your lenses within the frame you have chosen. Your PD can easily be measured in three simple steps.

NEW! Try our AccuPD™ mobile web tool to get your PD measured right now, designed specifically for use with a smartphone or tablet's front facing camera.

3 Simple Steps
Video Guide


Place a millimeter ruler on the bridge of your nose.


Have a friend face you about arm's length away.


Have your friend measure the distance between the center of your pupils (the black dots in the middle of your eyes).

Download A Printable Ruler

How to Measure Your Pupillary Distance

This video explains what a PD (Pupillary Distance) is and how to measure it.

More ways to measure

Simply Use a Mirror

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.

Ask Your Doctor

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

If you have two PD numbers on your prescription, you have either been given both the Distance/Reading or Right Eye/Left Eye.

Here's what you do:

  • Two of the same number: (e.g. 30/30) Either copy them this way or you can add them together. (In this example, you can either enter both numbers as 30/30, or just one number as 60. If one number is entered it’s understood we’ll split it evenly).
  • Two low numbers: (e.g. 30/31) The first number is the “monocular” PD for the right eye (O.D.) and the second number for the left eye (O.S.).
  • Two high numbers: (e.g. 62/59) The first number is your Distance PD and the second is your Near PD (for near-only reading glasses).

As a Guideline: Most adults' PDs are between 55-65 mm. Most kids' PDs are between 42-54 mm.

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