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
XS
< 42 mm
< 16 mm
<=128 mm
S
42 mm - 48 mm
16 mm - 17 mm
128 mm - 134 mm
M
49 mm - 52 mm
18 mm - 19 mm
135 mm - 141 mm
L
>52 mm
>19 mm
>= 141 mm
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