Camera try-on versus trying glasses on a photo
Most virtual glasses try-on tools paste a frame onto one uploaded photo. The result is a static collage: the frame does not turn with your head, and you never see how the glasses sit in profile. A camera try-on tracks the position and tilt of your head several times a second, so you can look sideways, lift your chin, and the frame comes with you. The profile view is usually what settles it.
What you need
A phone with a front camera and an up-to-date browser. It also works on a computer with a webcam, but the phone gives a truer result because you hold your face closer. You do not need an account, an e-mail address, or a photo of yourself.
Where your camera image goes
Nowhere. Face tracking and the rendering of the glasses both run inside your own browser; the image is not uploaded to a server and is not stored anywhere. Closing the tab ends the camera access. So you never have to hand a picture of your face to anyone in order to try glasses on.
Run an optical shop?
This is a demo of SpecsMirror. A shop gets it loaded with its own frames, its own logo and colours, and shares it as a single link or a QR code. It is paid for once, not every month.