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Lens Safety
Lenses of poor quality will make your eyes work harder, and can
cause your eyes to tear, squint, or blink. All lenses should be impact-resistant
and be made of optical-quality glass or plastic, both of which can be purchased
with or without a prescription. Impact-resistant does not mean the lenses are
shatterproof or unbreakable. It means that they can withstand moderate impact.
Eyewear for sports with flying balls or physical impact should be made of
polycarbonate. This is the most shatter-resistant material available today. Polycarbonate is also the best
choice for children's sunglasses.
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