An anti-scratch or scratch-resistant coating is a film or coating that can be applied to optical surfaces, such as the faces of a lens or photographic film. The coating does not interfere with how the lenses function and does not affect vision, but creates a permanent bond with the lens that reduces the appearance of hairline scratches which is common to eyeglass lenses. Though an anti-scratch coating is not 100% scratch-proof, it helps to prevent minor scratches that can easily happen to a regular lens. These minor scratches can damage the surface of the lens and impair vision. An anti-scratch coating acts as a protective layer thus making the lenses more durable.
In addition to lenses, anti-scratch coatings are often used on plastic products wherever optical clarity, weathering and chemical resistance are required. These include optical discs, displays, injection molded parts, gauges and other instruments, mirrors, signs, eye safety/protective goggles, and cosmetic packaging. These coatings are usually water-based or solvent-based. 
Anti-scratch coatings are generally applied via spray (hand or automated), dip, spin, roll or flow coating. Most coating types can be cleaned with a common glass cleaner and a soft cloth.
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