Mirrored Sunglasses For Men
Mirrored sunglasses are sunglasses with a reflective optical coating on the outside of the lenses (called a mirror or flash coating) to make them look like small mirrors.
The lenses typically give a brown or gray tint to the vision of the wearer. The mirror coating is very useful as it reduces the quantity and amount of light that passes through the tinted lens of the glasses by another 10–60 %, making it particularly useful and beneficial for sand, water, snow and higher altitudes.
Mirrored Sunglasses : Mechanism
Mirrored sunglasses are one-way mirrors.The mirror coating color is independent of the lens tint. The thickness and structure of the layer determines it.
Their popularity with U.S. police officers earned them the nickname of "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 with protective goggles, combined with a minimal plastic frame and a single piece of plastic serving as a nose pad). In the world of extreme sports, wraparound sunglasses are also quite popular.
Production
A single layer of a deposited thin film of an appropriate metal is the simplest version of a mirror coating, usually prepared by ion beam deposition, sputter deposition or vapor deposition. Such coating, however, is very prone to scratching and degrades, particularly in a corrosive environment such as salt water. More modern reflective coatings usually have several alternating layers of specific thickness, consisting of dielectric materials and metals at times. The metal layer can be made of titanium, nickel or chromium or an alloy such as Nichrome or Inconel and has a thickness of between 0.5 and 9 nanometers.
The dielectric layer consists of an appropriate oxide such as chromium oxide, silicon dioxide or titanium dioxide; its thickness determines the reflective properties of the dielectric mirror resulting from it. The production process is similar to making anti-reflective coating, and it is possible to deposit mirror and anti-reflective coatings in the same operation sequence. Mirror-coated lenses limit the amount of light that enters your eyes, making you more comfortable.
Why Mirror Coating?
Mirror coatings (also known as flash coatings) are highly reflective coatings applied to the sunglass lens front surface to reduce the amount of light entering the eye. In very bright conditions, such as snow skiing on a sunny day, this makes them particularly beneficial for activities.
One example of a flash coating is the mirrored sunglasses associated with state troops. However, the technology has advanced to include all the colors of the rainbow as well as silver, gold and copper metallic colors in today's mirror coatings. Hot pink, blue — there's almost any color.
A purely cosmetic decision is to choose the color of a mirror coating. The color of the mirror coating you choose does not affect your perception of color— it is the color under the coating of the tinted lens that determines how mirrored sunglasses affect your vision of color.
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