PD guide
How to Measure Pupillary Distance for Loupes
Pupillary distance helps align the optical system with your eyes. Accurate PD supports comfort, clarity, and a stable visual axis.
Built for customers preparing HeliosX measurements.
01
Best measurement sources
A well-reviewed smartphone PD app gives you a reliable measurement at home, and careful manual methods work too. Peer-reviewed research validates the smartphone approach for confident loupe orders without an extra appointment.
02
What the evidence says
A 2023 peer-reviewed study compared leading smartphone PD applications against a digital pupilometer and confirmed they measure accurately enough for confident at-home use. Used carefully, an app gives you the precision your HeliosX loupes are built around.
References
Questions
Quick answers
Can I use a smartphone app to measure PD?
Yes — a well-reviewed PD app gives you a reliable measurement at home, and peer-reviewed research validates the approach. Measure in good light, hold the phone level, and repeat once for confidence.
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Pupillary distance, working distance, and the steps that ship your custom build.