Super Impact Resistance
 Polycarbonate lenses are among the most impact resistant lenses available today. It is up to 60 times stronger than glass and up to 10 times stronger than hard resin lenses. Polycarbonate is the only high-index lens material that can be surfaced to a 1.0mm center thickness and still pass the FDA drop-ball test. So it is ideal for all customers, esp. childern, students, and sports enthusiast.