the lens will start jiancang

Keep an eye on it, Any department of Ophthalmology doctor will tell you, really is the right spectacle frame key alignment your eyesight is at its best, if you wear prescription glasses and sunglasses. The front part of the lens right need to align correctly ideal visual acuity eyes. But, when your doctor to remove cataracts, he or she will replace the lens implantation with UV coating, which means you will never again suffer from cataract. However, you still need sunscreen, protect your retina and macular, so will still be worth your investment sunglasses. Always check your frame, have a look whether they have the dislocation, and test the frame arm screw loose. If the glasses frame looks distorted, or if your camera does not seem to have a ride on your nose, let them as long as you can adjust. First of all, they not only have to flatter you to your face, they must also be comfortable. The materials used can greatly affect comfort. The glass is usually the best, because they are not easy to scratch the lens material. But they are heavy, can rest, play, so some people choose other materials, such as polycarbonate plastic, acrylic plastic, CR-39. Frame to a variety of materials, such as metal, nylon, plastic, can help create people want to have a look. Want to have a look, or elegant, or interesting, or indulge in the wildest fantasy? So many frames and lenses, have a look how. When you come to the room with your glasses, or is no longer exposed under UV irradiation, was reversed, the lens will start jiancang.
This reversal process often takes a long time, can be quite significantly depends on the ambient temperature, and the amount of ultraviolet light. It is colder, the particle velocity is faster (in the glasses case) or molecules (in plastic eyeglass case) reaction, either dark or light, depending on the exposure.
Although the use of transition glasses, on the beach or in a warm climate drawback is - they will reduce glare and add some eye protection, but they don't like dark completely colored prescription glasses, sunglasses.