Because contact lenses are attached to the cornea, and the eye almost forms a whole, compared with frame glasses, it has the following advantages: 1, the image is true. Frame glasses have a magnifying or reducing effect on the image, especially for people with high refractive error, often can not tolerate. And wearing contact lenses to see the image can be close to the real. 2, clear vision. Frame glasses can block part of the field of vision, highly concave and convex lens periphery will become a trigeminal role. 3, comfortable. Eliminate the frame glasses on the bridge of the nose pressure, auricular friction, frame allergies, etc.. 4, convenient. Especially for actors and athletes, there is no need to worry about the glasses being broken. When the temperature changes sharply and rapidly will not appear foggy, rainy day wearing lenses will not get wet. 5. Beauty. It shows the natural beauty of the wearer. For example, like highly myopic patients can avoid the unattractive bottoms of the lenses of frame glasses. 6. Correction of refractive disparity, especially for those with large refractive errors in one eye. For example, after cataract removal in one eye, only contact lenses can be worn.