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What Is Your PD?

How do you find it?

What Does PD mean?

Pupillary distance (PD) measures the distance between the centres of your pupils.

Why is it important?

This measurement is used to determine where you look through the lens of your glasses and should be as accurate as possible. The average adult’s PD is between 54-74 mm.

Where do I find my PD?

Your optometrist will usually measure your PD during an eye exam. If you can't find it you can give you optometrist a call who will be happy to provide it you.
But, if this somehow is forgotten or you aren’t sure its an accurate measurement, we can suggest two options to help you measure PD on your own.

Measure your PD with a ruler

(You can also ask a friend for help, be sure to look straight and at object a couple meters away.)


  1. Stand 8 inches away from a mirror.
  2. Hold a ruler against your brow.
  3. Close your right eye then align the ruler’s 0 mm with the centre of your left pupil.
  4. Look straight then close your left eye and open your right eye.
  5. The mm line that lines up to the centre of your right pupil is your PD


TIP: Measure 3-4 times and record your results. Take these measurements at various times during the day. Then, use the average of these measurements. That way, you can ensure consistency and accuracy.


Measure you PD using an App and a card


You can also measure you PD by downloading an app that does all the hard part for you. Use the following links to download the app onto your device and follow the instructions the app provides, all you'll need is a smartphone and standard magnetic card (e.g. a library card)



Apple Store

Android Play Store

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