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. 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.’ Characters in the cyberpunk genre frequently wear mirrorshades, and they are considered a hallmark of the subculture. Many characters in the movie series ‘The Matrix’ exclusively wear mirrored sunglasses, Morpheus in particular.
The Daily Omnivore 
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