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Mirrored sunglasses

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Mirrored sunglasses

Mirrored sunglasses are sunglasses with a reflective optical coating (called a mirror coating or flash coating) on the outside of the lenses to make them appear like small mirrors. The lenses typically give the wearer's vision a brown or grey tint. The mirror coating decreases the amount of light passing through the tinted lens by a further 10–60%, making it especially useful for conditions of sand, water, snow, and higher altitudes. Mirrored sunglasses are one-way mirrors.[citation needed]

The color of the mirror coating is independent of the tint of the lenses. It is determined by the thickness and structure of the layer.

Their popularity with police officers in the United States has earned them the nickname "cop shades". The two most popular styles for these are dual lenses set in metal frames (which are often confused with aviators), and wraparound (a single, smooth, semi-circular lens that covers both eyes and much of the same area of the face covered by protective goggles, combined with a minimal plastic frame and single piece of plastic serving as a nose pad). Wraparound sunglasses are also quite popular in the world of extreme sports.

Many sports take advantage of the reflective material in mirrored sunglasses. Especially in outdoor sports play, mirrored sunglasses are greatly beneficial to the wearer.

Sports that can use mirrored sunglasses include:

In outdoor sports, the glare of the sun can be very intense due to the reflection of the sun from water and snow.

The simplest version of a mirror coating is a single layer of a deposited thin film of a suitable metal, usually prepared by ion beam deposition, sputter deposition or vapor deposition. But this kind of coating is very prone to scratching, and degrades, especially in a corrosive environment like salt water.

The reflective coating on mirrored glasses can be very fragile and prone to scratching. Some high-end sunglass brands can come with anti-scratch coating. There can be steps implemented to protect the sunglasses and prevent scratching or damage.

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