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Interesting Facts About Eyewear |
| Date Added: March 21, 2010 10:12:23 PM |
| Author: cokntact59 |
| Category: Shopping |
| We wear sunglasses nowadays all year round. Fashion sunglasses represent not only a stylish accessory, they are essential to protect your eyes from UV rays. The UV-rays penetrating into the eyes may bring different ocular problems. Staying under the direct sunlight, both in summer and in winter, is unhealthy for your eyes. Our organisms were adapted to shield the eyes from sunlight – iris-contraction and squinting reflexes minimize the absorption of ultra-violet rays. But the UV-rays are active on an overcast day, so these natural defensive mechanisms aren't enough for absolute protection. That is when sunglasses go to the rescue. Modern sunglasses with ultra-violet coat characteristics are an effective device for individual protection from the sun radiation. For instance, wide-brimmed hats give only 50 per cent ultra-violet protection and aren't efficient in relation to light reflected from horizontal surfaces like grass, water or snow. That's the reason why your eyesight is misting and it's so hard to drive a car when the sun shines brightly. Eyes irritation and headaches are instant symptoms if you are under the sun for a long period of time. Furthermore, this all may lead to more severe diseases with time. Sunglasses with good UV cover characteristics in their turn give high level of sun shield and better eyesight in bright sunlight. The diversity of lenses with ultra-violet cover characteristics is wide, so you'll possibly need a brief guide to make a decision. First of all, do not forget that degree of darkening and color have nothing to do with the effectiveness of UV radiation shielding. You should pay attention to these characteristics when selecting the sunglasses depending on your activity. This way, middle-dark lenses are ideal for everyday wearing when at the same time staying under bright sun for a long time requires dark lenses. Polarized lenses are applied for driving or for water sports because this type of lenses diffracts the reflected light. For producing prescribed sunglasses producers apply photochromic lenses as optical transmission in these lenses is around 25-80%. Lenses used for different activities are also of various colors. In this way, grey lenses are chosen by decorators and painters. Brown and green lenses improve the contrast of colors. Multiple followers of the sportive style show preference to yellow lenses. Doesn't matter what type of lenses you choose, make sure that your sunglasses are with good UV protection coat. |
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