Identify Your Frame
The product data on your sunglasses can tell you the model and size of your frame, as well as other information. The frame size consists of three measurements, always shown in millimeters (mm): lens width, bridge size, and temple length. When purchasing replacement lenses we are only interested in the measurement of the lens width.
Many brands like Ray-Ban, Oakley, or Persol will often use the same model name or number but will offer several different sizes. Here are some examples:
Ray-Ban Original Wayfarers’ will all start with RB2140 but comes in 3 sizes: 47mm, 50mm, or 54mm.
The Oakley Gascan comes in 3 versions also: Standard, S, or Asian Fit.