What scratch resistanse coating is?
No eyeglass lens material not even glass is scratch-proof. However, a lens that is treated front and back with a clear, hard coating does become more resistant to scratching. Nowadays, most types of plastic lenses, including high-index, polycarbonate and traditional plastic materials, have built-in scratch-resistant coatings. Since it is sometimes optional, make sure your optician knows that you want scratch-resistant lenses in your prescription eyeglasses.
