How to Measure Your Pupillary Distance (PD)


What is Pupillary Distance?

Your pupillary distance measures the distance between the centre of each of your pupils. This measurement helps to ensure that your prescription is properly focused and centered for the clearest and most accurate vision.

How do I measure my PD?


If you need to measure a PD yourself, follow the instructions below for the most accurate results:

  1. Find a ruler with millimetre measurements and a mirror or a friend.
  2. If using a mirror, try to look into the distance as you measure. If a friend is taking your measurements, try to look past them into the distance to avoid the result being too narrow.
  3. Rest the ruler against the bridge of your nose and line up the middle of your left pupil with the 0 line of the ruler.
  4. Measure across to the middle of your right pupil, still looking into the distance. Your PD should be between 46 and 74.
  5. Repeat these steps 2 to 3 times to get a consistent number.

Where to look for your PD?

When shopping for your next pair of glasses, it’s important to have all of your prescription details handy to make the process quick and easy. If you’ve recently visited your eye doctor for a new exam, your PD should have been included with your refreshed script. If you don’t see it listed, there are one of two possibilities:

The prescription you have is for contact lenses.

Do you see measurements like “BC” (or base curve) and “Dia” (or diameter)? Is there a brand of contact lenses written out? If you do, you have a contact lens prescription. This won’t work for glasses. Parameters for contacts and glasses are different, and separate scripts are needed for each. We recommend that you contact your eye doctor to ask for your separate glasses prescription.

The PD was simply left off the prescription.

If this is the case, we always recommend that you first contact your eye doctor to see if they have this measurement on file for you. If not, you can choose to measure it yourself.

 Now you’re ready to find your perfect pair!


Frames featured:


Need Help?

Check out our most frequently asked questions or call our Vision Ambassadors at 0800 446 107

Be first to comment