How do Sunglasses Protect your Eyes?

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Millions of people throughout the world reach for their sunglasses everyday, its become second nature to a lot of us – but how do sunglasses actually protect our eyes?



The main job of sunglasses is to block the Suns UV rays – UV standing for ultraviolet. There's two different types of UV rays, the first is UVA which can cause early ageing and skin cancer. The second is UVB which is the cause of sunburn.



As you may have guessed, both UVA and UVB have higher frequencies than the light our eyes can manage. This basically means they can cause damage to our eyes, the same way they can damage our skin.
Interestingly sunglasses are not a modern invention, in prehistoric times, Inuit peoples wore flattened walrus ivory "glasses", where they looked through narrow slits to block harmful reflected rays of the Sun.

Today you'll find that most modern sunglasses are made from plastic, glass or polycarbonate. The first line of defence is a special UV coating, this is ultra-thin in structure and has a coat of reflective molecules which deflects light. The second layer is a scratch-resistant coating, this is made from a hard and durable polymer firm and protects the surface of the lens itself.



The third layer is a polarising film, this is intended to decrease the amount of glare coming off horizontal surfaces such as roads and water. The third layer is mainly designed to combat the UVB rays, as these can potentially destroy the outer cells of the cornea in the eye.

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