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There are several types of lens materials, such as Oakley's Plutonite
plastic, that have been developed by specific manufacturers.
Here below you can find some information about different types of
materials used in making sunglasses.
Tempered glass
Glass lenses are heavier offer the best viewing quality and are the most scratch-resistant.
For years glass was the only lens material available and glass still offers superior optics.
The primary disadvantages of glass are it's weight, generally twice that of hard resin, and it's potential danger of breakage.
Glass lenses can be heated or chemically tempered to increase impact resistance.
Organic plastic (CR-39)
CR-39 is an organic plastic made from hard resin that meets optical quality standards, CR-39 is thinner and weighs half as much as glass.
It exceeds the FDA requirements for impact-resistance.
Polycarbonate Plastic
Polycarbonate lenses are the most impact resistant lenses available and are often the lens of choice for young people and active persons
( These are a good choice for kids sunglasses, sports & outdoor activities, and safety glasses ). Polycarbonate lenses are high index and usually provide
the lightest, most comfortable lenses. They absorb all harmful UV light and can be made ultra thin because of their unique strength.
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