When you choose your glasses, you can check the fit using the following scheme:
If the template contains for example the measurement 55-16-148 means you will have:
-Diameter or width of the lenses (also called Caliber) of 55 mm i.e. 5.5 cm
-Bridge (distance between lenses) 16 mm or 1.6 cm
-Asta (length) by 148 mm or 14.8 cm
For any questions do not hesitate to contact us, we will be happy to give you more information.