Whois & Analysis for selectspecs.com

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.

"Satisfaction Guaranteed" is a science fiction short story by American writer Isaac Asimov, originally published in the April 1951 issue of Amazing Stories, and included in the collections Earth Is Room Enough (1957), The Rest of the Robots (1964), and The Complete Robot (1982).

Sunglasses or sun glasses are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes.

They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist, featuring lenses that are colored, polarized or darkened.

In the early 20th century, they were also known as sun cheaters (cheaters being an American slang term for glasses).