" of your
glasses. The eye size will be printed on the inside of either temple arm or the inside of the bridge. It
is typically followed by a box or a dash with the next number indicating the bridge width. In the example above,
the eye size is 50 and the bridge is 18. You will find either 5018 or 50-18 on printed on your
glasses. If it unreadable, measure across the lens of one eye at its widest part. The 140 is the temple
arm length and not used in clip-on fit.