Why is the lens coated

Mirror coating with three film layers, the first layer of antifouling film, to prevent dust and oil stains; The second layer of anti-reflection film, improve the lens light pass rate, so that the lens see things clearly; The third layer belongs to the hard membrane, play a role in preventing lens wear, scratching. Film lenses are divided into Small Round Eyeglasses and resin. It is also divided into two kinds in practicability: one is anti-ultraviolet film, which is coated with transparent materials of different refractive index and thickness on the surface of the Transition Lens Glasses, and uses the principle of light refraction to resist ultraviolet damage to the eyes. After the lens is added with anti-ultraviolet film, it can also play the role of anti-reflection, and enhance the light permeability, reduce glare, things more clear and bright. The other is to add hard film, in the lens surface plating a layer of hard film, so that the anti-wear ability of the Transition Lenses Colors enhanced. On the market, good quality lens coating price is more expensive. Cheap coatings do not protect the eyes. After adding the film, the Progressive Lenses Online appears green or blue or yellow when viewed from the side, indicating that it can resist the ultraviolet ray of the same color rate in the light. Green coated lenses are the most popular on the market.