Polycarbonate eyeglass is a type of eyeglasses that won’t crack easily. It is not 100% resistant against crack. However, it can endure pressure more efficiently. The ordinary plastic and glassws lenses will crack when they are succumbed to pressures. Polycarbonate lens is more expensive than the standard plastic lens. It is not necessary to buy eyeglass with polycarbonate lens unless you are a careless person. If you often drop your eyeglass, you can buy one that is made from polycarbonate lens. (more reading glasses…)