How about the lens coating? Why Coating? _Lens knowledge

When matching glasses, the relevant staff will introduce some relevant information about the lenses, and will recommend coated lenses according to personal living habits. Lens coating can not only protect the lens well, but also improve the permeability and reduce reflection. Lens coatings improve the performance of the lens, while also extending the life of the lens. Let's take a look at how the lens coating works together. Anti-reflection film mainly uses the principle of light interference to reduce some excess reflected light on the surface of the lens, by coating the surface of the lens with multiple layers of materials with different refractive indices and different thicknesses. After the interference of light, the reflected light on the surface of the lens is reduced, and the transmittance is increased, and the wearer will feel that the reflected light is reduced. It becomes clear when you see things. Hard coating Hard coating is mainly used to enhance the hardness and scratch resistance of the lens, and is widely used in resin lenses to enhance the hardness and wear resistance of resin lenses. This film layer is generally added on the front surface of the lens, and can also improve the permeability of the lens. Resin lenses can be coated with either an anti-reflection coating or a hard coating. Because glass lenses are relatively hard, generally only anti-reflection coatings are added. Anti-fouling and water-repellent membrane This membrane layer is also anti-fouling, reduces deposits, and is easy to clean. This kind of film is generally matched with a reflective film, and the anti-reflection film on the surface is easy to deposit stains, thereby reducing the amount of light transmission and reducing the effect of the anti-reflection film. The anti-fouling film can cover the porous anti-reflection film layer, which can make it difficult for water or oil to adhere to the surface of the lens. The material of this film layer is mainly fluoride, and the current common method is vacuum plating. Anti-radiation coating The substance of this coating is a metal compound. According to the principle of electromagnetic wave interference shielding, it has undergone a special coating process. Treated with special electric conductor film, the lens has anti-radiation effect. The film layer of the anti-radiation lens forms a barrier on the surface of the lens, absorbs and reflects low-frequency radiation and microwaves, and effectively filters out electromagnetic radiation waves. The polarizing film is made by the principle of polarization, which can effectively block glare and strong reflected light. The polarizing film includes a relatively thin polarizing film attached to the surface of the lens, and a thicker polarizing film sandwiched between the lenses. The polarized mode can soften the light and see things less dazzlingly.