Lenses are either glass or plastic. Plastic is more common. It’s lighter, the color range is greater, and it’s easily coated to adapt to light conditions. Green or gray lenses block light without distorting vision, give truest colors, and protect delicate skin around eyes. On overcast days brown or yellow lenses give the best visual contrast. Pastels (blue, pink) are mostly for looks. Use soap and water to clean your contact lenses: dry them with a soft cloth because the grit from a paper towel, or your shirt, may leave scratches. Tiny bottles of cleansing fluid from opticians are convenient, but no more effective. When the light is too bright, your natural defenses take over, the pupils of your eyes contract and you squint. Usually these natural reactions don’t provide adequate protection. Squinting cannot keep out ultraviolet rays or infrared rays. The results of over-exposure to the sun’s glare can be eyestrain, headaches, or a feeling of fatigue, and wrinkles around the eyes. A pair of effective sunglasses is an ideal solution. Always choose sunglasses with 90 percent to 100 percent UV protection, indicated on a lens, sticker or a tag.
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This information from :http://www.interestingtopics.net/things-you-can-do-with-hairdryer-id-600
