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Mirrored lenses have reflective coating that reduces the amount of light passing through to the eye.
Gradient lenses fade from a darker tint to a lighter tint, allowing for confortable xision over a wide range of distance and lighting conditions.
Keeping your sunglasses clean with help them - and you - look great and perform well. However, premium sunglasses and especially their lenses require careful treatment. Improper care can damage lenses, resulting in scratches or haziness, which in turn may cause eyestrain.
So, the best way to clean your sunglasses is by gently rubbing them with a lens cleaning cloth and a liquid cleaner specifically designed for eyewear lenses, or with a pre-moistened lens towelette.
To avoid damage, never clean your sunglasses with paper towels or clothing, which can grind dust and fibers into lenses and leave scratches. Also avoid using household detergents or soaps. While a few mild soaps don't harm lenses, today's extra strength soaps are powerful enough to slowly disintegrate lens coatings. Glass cleaners especially are highly corrosive and can damage your lenses quickly. They are not designed for use on the non-glass lens materials used in sunglasses.
While none of these products will do immediate apparent damage to your senses, over time and with repetition, the damage will become visible.