EyeglassCases

Reference

Frame size numbers, terms and definitions.

Diagram labeling lens width, bridge width and temple length on a pair of glassesReading 52-18-14052 lens width18 bridge140 templeTotal width is about 2 × lens + bridge + 6–14 mm52 + 52 + 18 = 122 mm, so roughly 128–136 mm across the front
Reference

Eyeglass Frame Size Numbers Explained (and How They Help You Pick a Case)

What the numbers on the inside of your glasses temple mean, how lens width, bridge and temple length relate to frame size, and how to estimate the case size you need.

Labeled diagram of glasses parts: bridge, lens, nose pad area, end piece, hinge, temple and temple tipParts of a pair of glassesBridgeLens / eyewireNose pad areaEnd piece & hingeTempleTemple tipFrame terms, lens terms and case terms are defined below.
Reference

Eyewear and Glasses Case Glossary

A plain-English glossary of eyewear, lens, frame and glasses case terms, from acetate and AR coating to spring hinges, temple tips and Trivex.