US: M to Europe Size 46-16-135
Cross-market adult eyewear and optical frame apparel conversion mapping M specifications into 46-16-135.

Analyzing Size Equivalence Across Markets
US: M: Corresponds to a lens width baseline of 52 (2.05 ), bridge width of 19 , temple arm length of 145 , and fit classification Standard / Regular Frame.
Europe Size 46-16-135: Corresponds to a lens width baseline of 46 (1.81 ), bridge width of 16 , temple arm length of 135 , and fit classification Narrow / Petite Frame.