Video Guide: How to Measure Your PD (Pupillary Distance)

When buying new prescription glasses, you will need to know your Pupillary Distance (PD) measurement. Simply put, this is the distance between the centre of your pupils. To help you understand the process of measuring your PD we have put together a short video showing you (with the help of another person) how to measure both your reading and distance Pupillary Distance measurement.

Here is a recap of the points in the video for measuring your PD:-

How to measure a friend's distance PD:
1. Sit opposite your friend at arm's distance apart.
2. Place the PD ruler on the bridge of your friend's nose.
3. Close your right eye and look directly into your friend's right eye. Your friend should look into your open eye.
4. Note the measurement from the centre of the ruler to the centre of your friend's pupil in millimeters.
5. Repeat with your other eye open.
6. Add the numbers together to work out your friend's PD measurement.

How to measure a friend's reading PD:
1. Sit opposite your friend at arm's distance apart.
2. Place the PD ruler on the bridge of your friend's nose.
3. Your friend should hold a pen around 30cm in front of their face and focus on it with both eyes.
4. Note the measurement from the centre of the ruler to the centre of each of your friend's pupils in millimeters.
5. Add the numbers together to work out your friend's PD measurement.

Can I measure my PD myself using a mirror?
No, this will give you an inaccurate reading as your eyes will converge. We always recommend asking for help from a friend, family member or colleague to get an accurate reading.

I need a PD Ruler, where can I find one?
You can order a PD Ruler from our website for a small fee.  This item is shipped next day from our UK office. See here to buy a PD Ruler.

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