This is an Anti-corrosion coating, which does not interfere with the functionality of the glasses or plexiglass, it depends on where you want to use the anti-scratch. Furthermore, it also does not affect vision through the glasses because it creates a permanent bond but not an opaque one.
Although the anti-scratch is not 100% resistant to scratching, it also helps primarily prevent minor scratches that can easily occur on glasses. These minor scratches can damage the surface of the glasses and reduce visibility. It is therefore a protective layer that makes the lenses more durable and safer.
Anti-corrosion coatings are also very often used wherever optical clarity, weather resistance, and chemical resistance are required. Examples include displays, mirrors, protective glasses, and many others. These coatings are usually water-based or solvent-based.
Anti-corrosion coatings are generally applied using sprays (manual or automated), dipping, spinning, rolling, or flowing. Most types of coatings can be cleaned with an ammonia-based glass cleaner and a soft cloth.