Best hot sale pure titanium frame NT3040, it's a prescription eyeglass, which is a lightweight eyeglasses frame with comfortable legs. Good for people daily wearing, suitable for single vision prescription. We recommend you choose Polycarbonate Safety Lenses to guarantee security. Concerning that the rimless frames which is far more fragile than full rim or half rim glasses always needs more durable lenses to protect the lenses crack, so concerning your case, we strongly recommend our friends to upgrade your lenses to Super Thin 1.61 Photochromic Lenses instead (which are more durable and can effectively protect the lens crack).