1. An anti-reflection coating (AR coating) is a dielectric thin-film coating applied to an optical surface in order to reduce the optical reflectivity of that surface in a certain wavelength range. Examples for applications are spectacles, optical systems like camera objectives, displays and solar cells.
2. An antireflective or anti-reflection (AR) coating is a type of optical coating applied to the surface of lenses and other optical elements to reduce reflection. In typical imaging systems, this improves the efficiency since less light is lost. In complex systems such as a telescope, the reduction in reflections also improves the contrast of the image by elimination of stray light. This is especially important in planetary astronomy. In other applications, the primary benefit is the elimination of the reflection itself, such as a coating on eyeglass lenses that makes the eyes of the wearer more visible to others, or a coating to reduce the glint from a covert viewer's binoculars or telescopic sight.
https://www.rp-photonics.com/anti_reflection_coatings.html (1.); https://en.wikipedia.org/wiki/Anti-reflective_coating (2.)
Author: Simon Waterstradt