Measure your PD in under a minute.
Your PD (pupillary distance) is the space between your pupils in millimetres — we need it to centre your lenses perfectly. No ruler, no guesswork: one photo with a bank card and our tool does the math. Measured it? Send it straight to our lab below with your order number.
Take the right photo
The card gives the tool a real-world scale — every bank and ID card is exactly 85.6 mm wide.
Card on forehead
Hold any bank or ID card flat against your forehead, long edge horizontal.
Photo from 1–2 metres
Have someone take the photo from 1–2 metres away, straight on at eye level. Glasses off.
Eyes on the lens
Look directly at the camera lens — not at the screen — with both eyes open.
Upload & measure
Upload your photo
JPG or PNG · taken as described above · processed right here in your browser, never uploaded to a server
Your measured PD
That reading is outside the typical adult range (45–80 mm). Double-check your markers, or send us the photo instead and our opticians will measure it for you.
Send your PD to our lab
Pop in your order number and we’ll match it up right away. Your prepaid shipping label follows within 4–6 hours of us having everything we need.
What is pupillary distance, and why does it matter?
Pupillary distance (PD) is the distance between the centres of your pupils, measured in millimetres. Most adults measure between 54 and 74 mm. Opticians use it to position the optical centre of each lens directly in front of each pupil — when the centres line up, you get the sharpest vision and the least eye strain. When they don’t, even a perfect prescription can feel “off”, especially with progressive lenses.
Your PD is sometimes printed on your prescription, but many eye doctors leave it off. That’s why we built this free tool: one photo with a standard bank card for scale, and you have an accurate number in under a minute — no ruler, no mirror tricks, and nothing to install.
Haven’t ordered your lenses yet?
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