Friday, December 18, 2009

Why people wear sunglasses

It is important to use sunglasses when go outside on a bright day, especially if you go to beach or snowing. There's the matter of sunlight bouncing off highly reflective surfaces like sand, water, and snow, causing a short-term but painful eye problem known as ultraviolet keratitis, or more commonly as snow-blindness. Acute over-exposure of the eye to UV light can temporarily damage the cornea.

Sunglasses come in various models and quality. When looking new pair of sunglasses, make sure you get sunglasses that provide full protection against two types of ultraviolet rays: UV-A and UV-B that can cause sunburn and cataracts. A good pair of sunglasses will have “UV protection” label on their package. So do not buy any sunglasses without "UV protection" label or if the label does not specify UV protection. It's also important to choose sunglasses designed for the activities you'll be participating in while wearing them.


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