Frame Size Guide
How frame sizing works
Every frame carries three numbers, usually printed inside the temple arm - for example 52-18-140.
- Eye size (52) - the width of each lens in millimetres. Most adult frames sit between 47 and 58.
- Bridge (18) - the gap between the lenses. A smaller number suits a narrower nose bridge.
- Temple (140) - the arm length from hinge to tip.
The easiest way to get it right
Take a pair that already fits you well and read the numbers inside the arm. Matching the eye size within a millimetre or two is usually all it takes - you’ll find the eye size for every frame on its product page.
A rough guide
- Eye size 47-50: smaller or narrower faces
- Eye size 51-54: most adults
- Eye size 55+: wider faces or a deliberately generous fit
Still unsure? Email info@thespectaclebureau.co.uk with the frame you like and the measurements of your current pair - we’re happy to advise before you order.
