| At present we wear sunglasses all year round. Fashion sunglasses are not only a stylish accessory, they are vital to protect your eyes from UV rays. The penetration of ultra-violet rays into the eyes may bring different ocular illnesses. Staying under the direct sunlight, in summer or in winter, is unhealthy for your eyes. Our organisms were adapted to shield the eyes from bright light – iris-contraction and squinting reflexes reduce the penetration of UV rays into the eyes. But the ultra-violet rays are still active on an overcast day, so the mentioned natural defensive mechanisms are not sufficient for absolute protection.
That is when wearing sunglasses goes to the rescue. Modern sunglasses with UV protection cover are an efficient device for individual protection against the sun radiation. For example, wide-brimmed hats give only 50% ultra-violet shielding and aren't effective against reflected light. This is why your sight is misting and it's so difficult to drive a car in a bright sunlight. Headaches and eyes irritation are instant symptoms if you stay under the sun rays for a long period of time. Besides, this all may bring to more severe diseases as time goes by. Sunglasses with good UV coat characteristics in their turn give high level of ultra-violet shield and better vision in bright sunlight.
The variety of lenses with UV protection cover is great, so you'll probably need a brief guide to take a decision.
Firstly, do not forget that level of darkening and color have nothing to do with the effectiveness of ultra-violet rays protection. You have to pay attention to these characteristics when choosing the sunglasses depending on your activity. In this way, middle-dark lenses are ideal for everyday wearing while staying under bright sun for a long period of time requires dark lenses.
Sunglasses with polarized lenses are applied for driving or for water sports since this type of lenses diffracts the light reflected from smooth surfaces. For manufacturing prescribed sunglasses producers apply photochromic lenses since optical transmission in these lenses is around 25-80%.
Lenses used for various activities are also of different colors. In such a way, grey lenses are chosen by decorators and painters. Brown and green lenses increase the contrast of colors. Numerous followers of the sportive style give their preference to yellow lenses.
No matter what type of lenses you prefer, make sure that your sunglasses are with good UV protection cover. |
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