As a special plastic, CR-39 has been the standard material for eyeglass lenses for many years. Lenses made from this material have only a half the weight of glass lenses. In addition, CR-39 eyeglass lenses have better UV light protection. Being less likely to shatter, CR-39 plastic eyeglasses can still be treated with advanced coatings such as scratch-resistant coating.

Generally plastic lenses have the impact resistant, making them a better choice for children, active *****s, sportswear, and safety wear. And it takes a far greater force to break a plastic lens than a comparable glass lens,while glass shatters, plastic will more likely dent. Probably the most appreciated feature of plastic lenses is that they can be thinner than glass lenses. On http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/http://www.eyeglassesclub.com/ you will find the best plastic lens for you.

Lens is very delicate which can be easily covered with dust, oil and fog. By this time you are about to see things blurry, so there are must be a piece of cloth at hand for cleaning. If you have more free time, you'd better to wash eyeglasses with soft water adding a bit shampoo would be better. At the same time, some scratch or broken signs may influence badly on correcting visions. Once you have found these problems, you have to purchase a new pair of lenses.