How to Measure Your PD
Your Pupillary Distance (PD) is the distance between the centres of your pupils, measured in millimetres. It ensures your lenses align perfectly with your eyes for optimal clarity and comfort.
3 Easy Ways to Measure Your PD at Home
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Method 1: Mirror & Ruler
- Stand approximately 20cm from a mirror.
- Hold a millimetre ruler against your browline.
- Close your right eye and align 0mm with the centre of your left pupil.
- Open your right eye, close your left, and read the mm value at the centre of your right pupil.
- Repeat 2–3 times and take the average for accuracy.
Most adults measure between 54mm and 74mm.
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Method 2: With a Friend
- Look straight ahead at a distant object (3+ metres away).
- Ask a friend to hold a millimetre ruler against your browline.
- They align 0mm with the centre of your right pupil.
- They read the mm value at the centre of your left pupil.
- Repeat 2–3 times for consistency.
This is usually the most accurate home method.
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Method 3: Printable Ruler
- Download and print our PD ruler (PDF).
- Make sure your printer is set to "Actual Size" (not "Fit to Page").
- Cut out the ruler and follow the instructions printed on it.
- Hold the ruler against your browline and measure as described.
Video Guide
A step-by-step walkthrough showing how to measure your PD at home.
Tips for an Accurate Measurement
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Measure in good, even lighting — avoid shadows on your face.
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Always measure 2–3 times and take the average.
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Look straight ahead at something at least 3 metres away.
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Use a millimetre ruler, not inches.
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If your previous glasses have a PD printed on them, check the inside arm or your dispensing record.
Common Questions
What if my PD is different from my optician's record?
A difference of 1–2mm is normal between measurements. If you're unsure, go with your optician's number — or email us and we'll help.
Do I need a separate PD for each eye?
A single (binocular) PD is fine for most orders. If your optician gave you two numbers (e.g. R: 31 / L: 32), enter them as split PD on the order form.
What if I can't measure it myself?
Any optician can measure your PD for you — most will do it for free or a small fee. Alternatively, email us and we'll advise.
What's a normal PD?
Most adults are between 54mm and 74mm. Children are typically 43mm to 58mm.
Got your PD? You're ready to order.
Browse our lens collections and enter your PD on the product page when you order.