AEVOGUE are perfect for anyone who wants the benefits of sun protection while wearing their prescription glasses. They're lightweight and easy to slip on over your prescription glasses. You'll want to keep a pair in the car, office, house or wherever you need them! AEVOGUE are designed to wrap around your face blocking the sun from the side as well; a practical alternative to expensive prescription sunglasses! AEVOGUE are polarized, providing increased clarity, reduced eye fatigue, and glare protection.How to measure your prescription frames for AEVOGUE sunglasses:1- Measure the widest part of your prescription frames left to right, this is the "width". Next measure the height of the lens with frame included. 2- Choose the AEVOGUE frame (below) that is slightly larger in width and height than your frame measurements.AEVOGUE sunglasses Specification: Width: 5.4inch (137mm)Height: 1.6inch(40mm)Bridge: 0.7inch (17mm)Temple: 5.9inch (150mm) CARETo avoid damage, never clean your sunglasses with paper towels or clothing, and also avoid using household detergents or soaps. While a few mild soaps don't harm lenses.