When selecting eyeglass lenses for children and adults facing eye-safety issues, polycarbonate is a fine choice. Lighter and thinner than regular plastic lenses, polycarbonate is up to 10 times more impact-resistant than ordinary plastic or glass, and it also filters out harmful UV rays. Because it is also less likely to fracture, polycarbonate lenses are a good choice for rimless eyewear. However, there now is a rival lens material that offers many of the advantages of polycarbonate, plus some important additional ones. Trivex lenses have impact resistance comparable to polycarbonate and are about ten percent lighter. Most importantly, because they are made from a cast molding process (not injection-molded, like polycarbonate), Trivex lenses provide better optical clarity. Lenses made with Trivex material are a great choice for anyone who leads an active life and expects clear, crisp vision correction, lightweight comfort, and protection from their eyewear. Both polycarbonate and Trivex lenses can be scratched relatively easily, which can be effectively addressed with a scratch-resistant coating.