It has many functions. Different films have different functions!
1. Hard coating---wear resistance
Generally, the hardening material silicon dioxide or organic silicon is polymerized by the soaking method, and is plated on the surface of the lens to prevent scratches , can also be directly plated on the lens substrate without any coating layer, effectively extending the use time of the lens.
2. Anti-reflection coating---anti-reflection coating
Generally, the vacuum coating method is used, that is, the lens is placed in a vacuum coating machine, and another substance is added under vacuum conditions , the most commonly used ones are lithium, magnesium and calcium fluorides, etc., which are evaporated and sprayed onto the surface of the lens to form a multi-layer film. After being coated with an anti-reflection coating
1: The light transmittance can be increased to 98 % or more, the vision will be clearer.
2: Reduce reflection. When taking photos with glasses, you can clearly see the eyes behind the glasses.
3: Increase beauty, reduce visual fatigue, and increase safety.
3. Hydrophobic and oleophobic film---anti-fouling and waterproof
A hydrophobic substance is used to coat the surface of the lens, forming an extremely tight network structure to prevent water and oil from adhering to the lens. On the lenses, it improves vision and makes lenses easier to clean, combined with an anti-reflective coating.