US: L to Europe Size 49-18-140

US: L: Corresponds to a lens width baseline of 54 $\text{mm}$ (2.13 $\text{in}$), bridge width of 20 $\text{mm}$, temple arm length of 145 $\text{mm}$, and fit classification Wide / Large Frame.

Europe Size 49-18-140: Corresponds to a lens width baseline of 49 $\text{mm}$ (1.93 $\text{in}$), bridge width of 18 $\text{mm}$, temple arm length of 140 $\text{mm}$, and fit classification Standard / Medium Frame.