Lenses and other optical elements can have an antireflective, antiglare, or anti-reflection (AR) coating added to the surface to lessen reflection. This increases efficiency in common imaging systems because less light is lost to reflection. The elimination of stray light from complex systems like cameras, binoculars, telescopes, and microscopes enhances contrast by reducing reflections. This is particularly crucial for planetary astronomy. Other applications, like a coating on eyeglass lenses that makes the wearer's eyes more visible to others or a coating to lessen the glint from a covert viewer's binoculars or telescopic sight, focus primarily on the eradication of the reflection itself. A secondary Anti-Reflective Coating that repels water and grease is frequently added to anti-reflection lenses, making cleaning and maintenance easier. High-index lenses are especially well suited for anti-reflection coatings since they reflect more light than lower-index lenses do without the coating (a consequence of the Fresnel equations). Additionally, coating high index lenses is typically simpler and less expensive.
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