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Measure Your Pupillary Distance

Wanna get your glasses just right? Then it’s important you know your Pupillary Distance — or PD for short. It might seem technical, but we’ll get your head around it in no time. 

How to measure your PD

Use our tool for the quickest way to figure out your PD. Get your laptop or phone camera ready and follow these instructions:

  1. Rest your phone or computer on a steady surface in a well-lit room.

  2. Turn up the volume, so you can hear the instructions.

  3. Look directly into the camera, not at yourself, despite the temptation.

  4. If you wear glasses, take them off.

  5. Grab your bank card (or anything with a magnetic strip). Light coloured cards work best.

  6. Click start scan — make sure you’ve allowed access to your camera, or all this will be for nothing.

  7. Hold the bank card by its top corner and hold it flat on your forehead. We might ask you to make small adjustments — just go with it.

  8. Once you’ve done this, you’ll have your PD. Make sure to note it down, so you can enter it with your prescription details at the checkout.

Some tips 

  • Whilst the distance between your pupils is one length, you’ll have to halve it to work out the PD for each eye, e.g. if your PD is 60mm, your left and right eyes will be 30mm each. 

  • If you can’t halve your PD to a round number, no problem - split them to the closest 0.5mm,  e.g. if your PD is 60.5mm, fill in: right = 30mm, left = 30.5mm. We see this quite a bit so, don’t worry, we know how to deal with it.

  • The average PD is somewhere between 58-68mm. If yours falls outside this, or you have a prescription over +/-6 SPH, get in touch with us and we’ll give you a helping hand.

  • Visiting one of our stores? Easy, our retail assistants will measure your PD for you.

What is Pupillary Distance?

Your Pupillary Distance (PD) is the difference between the centre of your right pupil and the centre of your left pupil, measured in millimetres. Knowing this number means we can make sure you’re always looking through the correct part of the lens, and we can’t actually make your glasses until we’ve got your unique PD.

Pupillary Distance Gino

Why is it important?

If your PD isn’t right, it can cause eye strain, fatigue, or simply not being able to see properly. The higher your prescription, the bigger the effect an incorrect PD can have.

Your eyes should view the world through the best part of your lenses and since your pupils are in the middle of your eye, we make your lenses with that central point in mind.  So, get measuring! Don’t forget: if something doesn’t feel right, you can always contact us for corrections.

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