| At present sunglasses are worn all year round. Designer sunglasses represent not only a stylish accessory, they are vitally important to protect your eyes against ultra-violet radiation. The penetration of UV-rays into the eyes may bring various ophthalmologic illnesses. Staying under the sunlight, in summer or in winter, is very harmful for your eyes. Our organisms were adapted to shield the eyes from bright light – squinting and iris-contraction reflexes reduce the penetration of UV radiation into the eyes. But the UV-rays are still active on a cloud day as well, so the mentioned natural mechanisms aren't sufficient for absolute protection.
That is when wearing sunglasses goes to the rescue. Contemporary sunglasses with UV cover characteristics represent an effective appliance for individual shielding from the sun radiation. For example, wide-brimmed hats give only 50 per cent ultra-violet shielding and are not effective in relation to light reflected from smooth surfaces like water, grass and snow. This is the reason why your vision is misting and it is so hard to drive a car in a bright sunlight. Eyes irritation and headaches are momentary symptoms if you stay under the sun for a long time. Furthermore, this all may lead to more severe problems with time. Sunglasses with good UV cover characteristics in their turn give high level of ultra-violet shield and better eyesight in bright sunlight.
The diversity of lenses with UV protection coat is great, so you will possibly need a guide to make your choice.
Firstly, take into consideration that level of darkening and color have nothing in common with the efficiency of UV radiation shielding. You should take these features into consideration when selecting the sunglasses depending on your activity. This way, middle-dark lenses are perfect for wearing everyday when at the same time staying under bright sun for a long period of time requires dark lenses.
Polarized lenses are used for driving or for water sports because the mentioned type of lenses diffracts the light reflected from smooth surfaces. For producing prescribed sunglasses producers apply photochromic lenses since optical transmission in these lenses is around 25-80 per cent.
There are also lenses of different colors used for various activities. In such a way, grey lenses are chosen by decorators and painters. Green and brown lenses increase the range of contrast. Numerous followers of the sportive style show preference to yellow lenses.
Doesn't matter what type of lenses you prefer, make certain that your sunglasses are with good ultra-violet protection coat. |
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