Lenses in sports eyewear usually are made of polycarbonate. Since polycarbonate is such an impact-resistant lens material, it works well to protect eyes from fast-moving objects. Polycarbonate lenses are up to 10 times more impact-resistant than plastic or glass lenses. They are also lightweight, strong and durable. Polycarbonate lenses set the standard in eyewear safety. These lenses are a smart choice for athletes, those who work in hazardous job environments.

Lenses that are treated front and back with a clear, scratch-resistant coating have a much smoother surface that is more resistant to scratching.
The coating does not interfere with how the lens functions and does not affect vision. Though an anti-scratch coating is not 100% scratch-proof, but it helps to prevent minor scratches that can easily happen to a regular lens. These minor scratches can damage the surface of the lens and impair vision. An anti-scratch coating acts as a protective layer thus making the lenses more durable and safe.