The numbers found on your frame aren't necessarily self-explanatory, so here is an easy guide to understanding the numbers and size of your frame. The method of expression commonly used is known as the boxing system and the numbers are generally written the same way regardless of the brand of glasses. These numbers are usually found printed on the inside of one of the frame's temple legs. All numbers are expressed in millimeters (mm).
How can I check the size of my frame?
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