Frame Number Decoder
Type the three numbers inside the arm of your glasses. See which is lens width, bridge and temple length, drawn to scale, and compare a new frame with a pair that fits.
Before you shop for frames, online or in person.
Fit Desk tools
Two small tools to help you prepare for choosing glasses: one reads the size numbers on a frame, the other lays out lens options side by side. They work in your browser, need no account, and do not replace a fitting with an optician.
Lens comparison
Lens design, lens material, coatings and sun options are four separate choices. Compare the options within each one, side by side, with what each is good for and what it trades off.
Before you talk lenses with an optician.
How these tools handle what you type
Everything runs on this page. We do not ask for photos, your prescription, your name or contact details, and nothing you enter is saved or sent. Our site analytics records only that a tool was used, never the values. The tools explain options; they do not measure your face, check your eyes or choose lenses for you.