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If you already have a pair of glasses, you can compare the measurements to your current frame. Just look inside your temple to find your frame measurements. The overall frame size is a combination of lens and bridge's width measurements.

 

  Lens Width Bridge Width Temple Length
Small 42-48mm 16-17mm 130-135mm
Medium 49-52mm 18-19mm 136-140mm
Large 53-58mm 20-22mm 141-150mm