Now when we wear glasses, we require the use of coated lenses. For ophthalmic resin lenses, the main optical films include hard coating, anti-reflection coating (anti-reflection coating) and so on. Do you know the characteristics of each layer of lens coating? Follow the editor of CB Layer Coating lens for a simple understanding!
1. Add dura mater. The hardness of the resin lens is low, and the surface of the lens is prone to scratches. In order to improve the wear resistance of the lens, it is necessary to plate a hard film on the surface of the lens. At present, silicon atoms are often used for hardening treatment, that is, hardening liquid containing organic matrix and inorganic ultrafine particles including silicon element is used to make the hard film possess toughness and hardness at the same time. Modern hard coating technology mainly uses the immersion method. The hard film coating is thicker, about 3～5μm. For hard-coated resin lenses, it can be identified by the sound of knocking on the tabletop and the color brightness of the lens. The lenses with crisp sound and bright edges are hardened.

2. Anti-reflection film. The anti-reflection film uses the principle of interference to make the light passing through the film cancel each other to achieve the purpose of anti-reflection. The anti-reflection film can reduce the reflection loss of light energy on the surface of the lens to improve the imaging intensity and resolution. In order to meet the requirement of low reflection in a wide spectral range, three or more layers of anti-reflection coatings are required. The thickness of the current multilayer anti-reflection film is about 0.3 μm, and high-purity metal oxide materials such as titanium oxide and zirconium oxide are mostly used to coat the surface of the resin lens through an evaporation process to achieve a good anti-reflection effect. After the anti-reflection coating is coated, there will be residual colors, mostly green. For lenses that need to be hardened, they must be hardened first and then coated with anti-reflection coating.
The above is the introduction of the editor of CB Layer Coating lens: about the characteristics of each layer of the lens coating.