POLYCARBONATE LENSES

Polycarbonate lenses are not only thinner and lighter in weight than traditional plastic lenses they also offer (UV) protection and scratch resistance. In addition, they are very impact resistant.
Polycarbonate lenses are safer than traditional lens materials because they aren't brittle. They won't usually break if they come into contact with fast-moving objects such as balls, racquets or any other high impact.
Regular glass and plastic lens materials shatter upon violent contact in the same way that car safety glass does. Pieces of the lens are sprayed around, which potentially can cause injury to the eye. That's why polycarbonate lenses, which hold up better under impact, are recommended in children's glasses and safety eyewear.