Your sunglasses must provide protection from ultraviolet radiation, a component of sunlight that contributes to eye disease. The FDA, the government agency that oversees sunglass manufacture and sales in the U.S., recommends you look for sunglasses with lenses that block 99-100% of UVA and UVB radiation. The label should read either UV 400 or 100% UV protection.About sunglasses lens materials
Sunglasses lens materials differ quite a bit. Some area heavier than others and some types are more durable. Three materials are commonly used for sunglass lenses:
- Polycarbonate, a durable lightweight plastic.
- CR-39, a plastic used mostly in prescription-grade lenses.
- Glass, durable but much heavier to wear.
Designer and specialty sunglasses, like the kinds used for sports, cost more than most sunglasses, but you'll find all kinds of fashion glasses for sale at affordable prices. Watch the UV ratings carefully and you'll be fine.
Unless you already know which frame shapes look good on you, go shopping and try on as many styles as possible. If you can get permission to walk outside with glasses on, do it, so that you can find out how they actually work in the sunlight.
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