If you think that regular eyeglasses or sunglasses will offer the protection your eyes need when you play sports, you are sorely mistaken. Tests of the most commonly used lens materials show that all but one type shatters at levels below those set by government safety standards. For example, allyl resin (currently the most popular lens material) shatters when hit by a tennis ball at 55 miles per hour. It is not uncommon for the average player to hit a ball 70 m.p.h. Only polycarbonate, which resists shattering even when hit by a baseball at 135 m.p.h., has proven that it can stand up to the abuse likely to be meted out by the typical weekend athlete. Prevent Blindness America reports that hospital emergency rooms treat more than 40,000 eye injuries every year that are sports-related. Even non-contact sports such as badminton can present inherent dangers to the eyes. Sports goggles are made in a variety of shapes and sizes. Many are designed for racquet sports and are available for basketball and soccer. Sports and recreational activities cause more than 40,000 eye injuries each year, with basketball and baseball causing the most eye injuries, followed by water sports and racquet sports.