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Sunglasses have morphed from simple sun protection to fashion icons with some even containing prescriptions to help improve sight.
In space, astronauts wear special sunglasses with a thin layer of gold coating for protection as the sun is more intense than on Earth. Sports sunglasses are also more durable and resistant to shatter.
For normal consumers, sunglasses are a way to prevent damage or discomfort from the sunlight or to serve as a fashion statement.
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