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Sunglasses- Purpose and Design Sunglasses are becoming more and more popular these days When picking a pair of sunglasses the ones which have cool looking and famous brands are the most attracting ones to consumers People tend to forget the real functions one pair of sunglasses can provide A good pair of sunglasses should have these qualities 1 Provide protection from ultraviolet rays in sunlight Good sunglasses can eliminate UV rays completely 2 Provide protection from intense light 3 Sunglasses provide protection from glare Good sunglasses can completely eliminate glare using polarization 4 Sunglasses eliminate specific frequencies of light Certain frequencies of light can blur vision and others can enhance contrast Choosing the right color for your sunglasses lets them work better in specific situations Intensity Reduction The brightness or intensity of light is measured in lumens For example when you are indoors most artificial light is around 400 to 600 lumens If you go outside on a sunny day the brightness ranges from about 1000 lumens in the shade to more than 6000 lumens on a large stretch of concrete like a highway Our eyes are comfortable until we get to around 3500 lumens When the brightness of the direct or reflected light gets to about 4000 lumens our eyes begin to have difficulty absorbing the light What we see when we try to look at these brighter areas are flashes of white -- this is glare To reduce the discomfort caused by the amount of light entering our eyes we squint Once you get to around 10000 lumens your eyes are so bombarded that they begin to completely block out the light Prolonged exposure to light of such intensity can cause damage resulting in temporary or even permanent blindness Normally a good pair of sunglasses adopts two ways to reduce the intensity of light going into eyes Mirroring Reflective sunglasses often have a mirrored look The
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