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Because our eyes can''t cool themselves easily, ir rays cause eye fatigue and dry up our eyes'' natural moisture. Sunglass lenses protect the eyes from the effects of ir by absorbing the radiation. This may be beneficial wengerdealers to people wengerdealers who wear contact lenses whose eyes tend to dry out easily. It is important wengerdealers to note that there is no scientific evidence to indicate that ir rays are harmful. Different ultraviolet rays ultraviolet rays have shorter wavelengths and wengerdealers more energy than visible light rays. They can have a harmful effect on the eyes immediately or cumulatively from regular exposure over a number of years. The industry has set standards for how much uv may be transmitted (passed) by types of sunglasses. Ultraviolet (uv) rays are strongest at high altitudes, low latitudes, and in open or reflective environments (like wengerdealers sand, snow, or water). They are also strongest at midday.

Some important medical facts about kids and the sun damage to the eye are cumulative, increasing from year to year. So, the earlier children start protecting their eyes, the better. How much light the lens absorbs depends on its darkness. A mirrored coating on the lens is helpful in reducing the amount of glare caused by reflection. This now leads us to the question of how much light sunglasses should absorb. Overall, of course, this depends on how and where one is going to use the sunglasses. For fashion wear; may provide some protection for around town wear; not very helpful on beach or ski slopes. The ozone layer: the disappearing shield the upper layer of the earth''s atmosphere is often called the "ozone layer." wengerdealers this layer is the critical barrier guarding the earth from harmful uv light. Many believe that certain man-made chemicals have seriously depleted the ozone layer resulting in an increase in the amount of uv radiation wengerdealers reaching the earth.

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