This is a general guide depending on the frame and brand you choose. For example a medium size frame in millimetres will be shown as: 48-18-138.
Eyewear Frame Size guide
Lens Width
EXTRA SMALL BELOW 42
SMALL 42-48
MEDIUM 49-50
LARGE 53-58
EXTRA LARGE ABOVE 58
Bridge Width
XS BELOW 16
S 16-17
M 18-19
L 20-23
XL ABOVE 23
Frame Width
XS BELOW 130
S 130-135
M 136-140
L 141-150
XL ABOVE 150
Lens Categories
0-3N or P Refers to Category Level of UV protection while N is Non polarised and P for Polarised options. Shown as 2N