How to Find Your Sunglass Model and Lens Size To Get Correct Replacement Lenses
Other brands such as Oakley, Electric, Von Zipper, and Spy usually only has one size. They also use names more often than model number. If they do have different sizes they usually have an S added to the name for small. Oakely also make Asian Fit frames which are tighter fitting frames.
One exmple: The Oakley Gascan sunglasses come in the original Gascan, Gascan S, and Gascan Asian Fit. Most of the time they are different size lenses.
The Sunglass Industry measures lens maximum width, parallel to the ground, as the crow flies. Not Along the lens Curve.
1) The maximum width in Millimeters (convert inches by making into decimal and multiplying by 25.4)
Example: 2 and 3/8's of an inch becomes 2,875 inches * 25.4 = 60mm
2) As the crow flies, not along the curve of the lens
If you are measuring lenses still in your frames please allow for 1-2mm for the portion of the lens under the rim.