Lens can be divided into daily general lenses, protective lenses and multi-focus lenses according to their functions.
Daily general lens.It refers to the optical lens with single focus and no special function. It is the most widely used optical lens.
1. Anti-Blue Lens .Blu-ray lens is a kind of digital protective lens which can effectively block high-energy harmful blue light, retain useful blue light and reduce the harm of blue light to eyes. It is suitable for wearing when using LED digital display devices such as TV, computer, PAD and mobile phone.2.Sunglasses selectively absorb parts of the band that make up the sun's light with the help of metal powder, shielding from uncomfortable strong light. 3. Polarizing lenses.In order to filter these dazzling rays, a special vertical coating is added to the lens, which is called polarizing lens. It can effectively suppress the strong light, even if it is not easy to glare directly at the sun. It is most suitable for outdoor sports (such as driving, skiing or fishing).4. Intelligent discolored lenses Also known as "photosensitive lens", usually through adding silver halide substance to the lens itself or rotating coating on the surface of the lens to achieve discoloration, the lens darkens under strong light, becomes transparent under indoor light, automatically adjusts the color of the lens according to the intensity of light/ultraviolet rays, a dual-purpose lens, automatically blocking ultraviolet rays. 5. Motion lenses
Safety protective lenses worn in sports pay attention to safety and protective performance. This kind of lens generally refers to KR super-tough lens in PC lens or resin lens. It has high strength toughness, strong impact resistance, non-fragile and safer.
progressive lenses.It means that there are many focal points on a lens, the curvature of the front surface of the lens increases continuously from the top to the bottom, and the refractive force increases gradually and continuously from the remote area located at the upper part of the lens to the near area at the bottom of the lens to reach the required near diopter. A pair of glasses can see not only the distant, but also the near and the medium distance objects. Progressive lenses are described as "zoom lenses". After wearing them, a pair of glasses is equivalent to multi-glasses. For example, suitable for students to read and write lenses (to meet the visual needs of looking at the blackboard, reading, doing homework, etc.), suitable for white-collar people to resist fatigue lenses (to adapt to remote, medium and near visual switching, easy to cope with work), suitable for middle-aged and elderly people to gradually adapt lenses (freely customized curved surface, remote, medium and close switching, not dizzy and not swollen).