About PDMeasure
PDMeasure is a free tool for measuring your pupillary distance (PD) — the number you need to order glasses online — using your device's camera, entirely in your browser. This page explains who builds it, why it exists, and the principles behind it.
Who's behind it
PDMeasure is built and maintained by Mora Tecnologia Ltda, a technology company with a simple focus: making genuinely useful web tools and putting them within easy reach of the people who need them.
That focus comes with a deliberate choice about how we operate. We're not a store, and we're not here to sell you anything. A lot of the web works by putting a useful tool in front of you and then steering you toward a purchase — an upsell, an affiliate funnel, a "premium" version of the thing you actually came for. We'd rather just build the tool, make it work well, and be honest about what it does and doesn't do. That principle shapes every decision on this site.
Why PDMeasure exists
Ordering glasses online runs into a small, frustrating wall: a field asking for your PD, a measurement most people have never heard of and can't find on their prescription. The usual options aren't great — squinting at a ruler in a mirror, or handing your face to an app that uploads your photo to a server you know nothing about.
We built PDMeasure to solve that specific problem in a way that respects the person using it. It measures your PD from your camera in a few seconds, and — the part that matters most — nothing ever leaves your device. The face detection and the math run locally in your browser. No image, no video, no measurement is uploaded or stored anywhere. There's no account to create and nothing to install.
How it works, honestly
The tool uses on-device AI to find 478 points on your face, including the iris, and uses a known real-world length as a ruler: the human iris is remarkably consistent in size across adults, about 11.7 mm across. Because that width barely varies from person to person, the software can use it to calculate scale and measure the distance between your pupils — no card, no ruler, just your camera. There's also an optional card-calibration method for anyone who wants a second reference.
We're deliberate about not overstating accuracy. In good conditions the results typically land within a millimeter or two of a professional measurement — plenty for most everyday single-vision glasses. For strong or progressive prescriptions, where a small error matters more, we say plainly that it's worth confirming against a professional measurement, and our guides explain exactly when and why. A tool that's honest about its limits is more useful than one that pretends to be perfect.
What we believe
A few principles run through everything Mora Tecnologia builds:
Privacy isn't a feature, it's the design. Everything runs on your device because that's the right way to handle something as personal as your face. This isn't a setting you toggle — it's how the tool is built from the ground up.
Honesty over hype. We won't overstate how accurate a home measurement can be, and we won't push you toward a purchase. The site is the tool and the guides — nothing else. When a professional measurement is the safer call, we say so.
Real sources, no invented facts. Our articles cite real, verifiable sources — anthropometric studies, manufacturer policies, optical standards. When something can't be verified, we say that instead of guessing. A claim you can check is worth more than one you can't.
Screening, not diagnosis. The vision tests here — the PD tool, plus the astigmatism and color-vision screeners — are educational aids to help you decide whether to see a professional. They don't replace an eye exam, and we're clear about that everywhere it matters.
Get in touch
Questions, corrections, and feedback are genuinely welcome — if something on the site is wrong or unclear, we want to fix it. You can reach Mora Tecnologia at contact@pdmeasure.com.