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Most sunglasses come in three lens types, plastic, polycarbonate, or glass. Glass lenses are better for many situations, and should not distort as much as cheap plastic lenses. It is also heavier than the other materials. You can see high quality glass lenses in the Serengeti Trek Sunglasses. Polycarbonate lenses are more durable, and perfect for kids' sunglasses, many extreme sports, and in any situation where sunglasses could be damaged or broken by work or play. They also come in many designer brand shades like Christian Dior Sunglasses. Plastic lenses usually come in less expensive discount sunglasses, like the Ray-Ban Outsiders Wayfarer Sunglasses, which although more susceptible to scratching and breaking, still offer high quality for the money.