Your camera runs entirely on this device. No video, no photo and no face data ever leaves your phone —
there is no server in this at all.
Frames are placed at their true manufactured size against your own face, so what you see is the real fit.
Works best in even light, facing the camera.
Hold any bank card flat against your cheek, in line with your eyes.
Drag and resize the gold rectangle until it sits exactly on the card, then measure.
Every card on earth is 85.60 mm wide, so this gives your real measurements.