This tool uses your iris diameter as a built-in scale reference; the human iris is always 11.7mm. No card or object needed. Simply look at your screen.
We tested the tool with 50 participants over one week, supervised by three opticians. Each participant used their own phone and followed the same on-screen instructions you'll see above, and every result was then confirmed with a pupilometer, the device an optician uses to measure PD. 45 of the 50 measurements came back correct or within 1.5 millimeters of the pupilometer reading. The other 5 missed by more than 1.5 millimeters, and each traced back to the capture rather than the tool: did not stay still, angled their phone, or skipped setup steps entirely. In September 2026 the capture was rebuilt to address exactly those three: it now photographs only steady, square-on frames during a five-second count and combines several shots into one reading, and in repeated testing against a pupilometer it lands within 0.5 to 1 millimeter. Follow the guidance and make sure to hold still. This tool is free and takes about two minutes to use, so try it out for yourself.
Your camera measures your face for a few seconds, the numbers pick from every frame we make, and the box ships free. Everything is measured in your browser; the picture never leaves your phone.
Glasses off, hair away from your jaw, face the camera straight on in decent light.
The camera measures your face on your device, nothing is recorded, uploaded or saved. See our privacy policy for more details.
Unfortunately, we don't have any direct partnerships with vision insurance providers, but we can assist you in getting a reimbursement for your purchase after you have paid in full at the time of purchase. In order to be reimbursed, you will first need to fill out a form from your insurance provider. After you fill out their reimbursement form, you will need to provide an itemized receipt, which we can provide you with once you have completed your purchase. We've provided some links below of popular vision insurance providers to help you get started.
Please contact your vision insurance for more information on how to file for a reimbursement.
If you have any question or you need an itemized receipt, please email us at [email protected]
We accept both FSA and HSA payments, as long as they are in the form of a credit or debit card. After you have had completed a purchase with your FSA/HSA, you can then file for a reimbursement with your vision insurance provider.
