For lens production, the common materials are resin lens, glass lens, PC lens, nylon lens, AC lens and polarized lens.
-- Resin lenses have the characteristics of light weight, high temperature resistance and non-breakability, and can effectively block ultraviolet rays. At present, they are widely used in myopia glasses.
However, at the same time, the wear resistance and corrosion resistance of resin lenses are not as good as those of glass lenses, and scratches are more likely to occur. So this is often improved by coating.
Resin lenses also have a very big disadvantage, that is, they are easily deformed, and are very easily affected by heat, softened or expanded, resulting in lens deformation.
-- PC lens, the material is polycarbonate, which is the lightest of all lens materials at present. This material is also known as "space sheet" and "safety sheet" because of its lightness and impact resistance.
-- AC lenses are also resin lenses, but the process is different. AC lenses should be softer, stronger and have better anti-fog performance. Lens material suitable for some special-purpose sunglasses.
-- Glass lens, scratch-resistant, wear-resistant, the lens is relatively thin. The optical performance is good, the price is relatively low, and the clarity will be higher than that of resin lenses. The big disadvantage is that it breaks easily.
-- Nylon lens, strong impact resistance, very suitable for some protective sunglasses lens material.
-- Polarized lenses are globally recognized as the most suitable lenses for driving. The best choice of sunglasses for drivers and fishing enthusiasts. However, the requirements for the lens itself are relatively high. If the curvature of the lens does not reach the optical standard refraction state, the durability will be reduced.
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