The different refractive indices of air and glass cause reflections on spectacle lenses which impair the wearer’s vision.
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Hard coatings are today a standard within an antireflection coating. Therefore lacquers are used which form an almost ideal buffer between the lens surface and the more brittle AR coating.
Dirt or marks such as fingerprints or water stains are more noticeable on coated lenses, as they impair the antireflection properties of the coating. It was for this reason that a hydrophobic (water-repellent) coating was developed for lenses with a multilayer coating to make it more difficult for dust and dirt particles to adhere to the lens.
The attractive brown tint of Umbra ensures natural colour rendition and excellent recognition of traffic signal lights.
Mirror coatings create interesting effects on spectacle lenses - from a light shimmer to a total mirror coating.
Here you can find some info about production aspects and Facts and Figures on a mirror coating.