| Since its creation in 1970s, polycarbonate has been | | | | molding process. The production of a polycarbonate |
| widely used in aerospace applications, helmet visors | | | | lens uses an injection molding process, during which |
| of astronauts and space shuttle windshields. Today, | | | | small pellets will be heated into liquid polycarbonate. |
| this material has been the standard for safety | | | | Further steps include liquid polycarbonate injection and |
| glasses, full frame glasses and men eyeglasses. | | | | high-pressure compression. Another lens material that |
| Polycarbonate lenses are thinner, lighter and 10 times | | | | also has similar features of polycarbonate is Trivex. |
| more impact-resistant than traditional plastic lenses. | | | | Using cast-molded manner, Trivex lenses provide |
| Polycarbonate lenses are made in a way that is quite | | | | crisper vision and have become a major rival of |
| different from that of regular plastic lenses. | | | | polycarbonate lenses. |
| Conventional plastic lenses are made from a cast | | | | |