Size Guide
The frame measurements means the following:
1 = This measurement is the width of the bridge e.g. 18mm
2 = This measurement is the width of each lens e.g. 54mm
3 = This measurement is the length of the arm e.g. 135mm

Most frame measurements can be seen on the arm and/or the bridge of the frame. So it may read 51/17/180. If you have any difficulties please contact us.