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What are the advantages and disadvantages of polycarbonate spectacle lenses?

Answer: 

Polycarbonate lenses are made by injection moulding.

These lenses have good impact resistance, making them ideal for children, sports and industrial work. They also have good UV protection and a higher refractive index than CR39.

Disadvantages include the fact that their abrasion resistance is poor - adding an anti-scratch coating can help but reduces the impact resistance slightly. These types of lenses cannot be tinted easily, either.

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