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While many people choose sunglasses based on looks, they are designed to do a specific task - that of protecting the eyes from ultra-violet radiation. If you simply choose sunnies that look cool, you could be setting yourself up for eye problems later on. And if you get headaches after being out in the sun much, them your sunglasses are not performing the way they should.

Ultra-violet radiation is one of the major causes of eye disease such as macular degeneration, which leads to irreversible blindness. Your sunglasses need to have lenses that block from 99% to 100% UVB and UVA radiation to protect your eyes sufficiently. There should be a sticker on the lens of the sunnies that give you this rating either as UV 400 or 100% UV.

Lens material can be made from polycarbonate, a type of plastic; CR-39 a plastic used mainly in prescription sunnies, or glass. While glass is durable, it is also heavier to wear than plastic. Each material is coated with a UV filter, plus various other coatings. Different colours are coated over the lenses and give different effects. Grey reduces brightness without distorting colour; brown and amber reduce glare but make things look hazy; yellow and green provide good contrast but distort colour somewhat, while rose is better for water sports.

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