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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 shoppingwatchswissarmy amount shoppingwatchswissarmy 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; shoppingwatchswissarmy 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." 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 reaching the earth.

Green lenses only allow the most useful light to reach the eye for greatest visual acuity. They are the most preferred of all lens colors. Yellow lenses are a long time standard in the ski industry. Provides excellent depth shoppingwatchswissarmy perception and contrast in low light. Vermilion or rose these colors provide excellent perception in low light conditions while allowing a tolerable level of light transmission in bright sunlight. Used to contrast objects against blue and green backgrounds. . Basics facts about lenses all our sunglasses have optically correct lenses (and provide 100% uv protection). A person looking through a non-optically correct lens has to continually refocus due to distortion. This strain on the eye can eventually lead to headaches, nausea and dizziness. Our optically correct lenses prevent these problems. These lenses are fixed in the percentage of light they absorb and appear as one color. They provide excellent glare protection and are a good choice for those who are often in bright sunshine.

Lighting glare can come directly from a light source - like driving toward the sun - or be reflected. At times, the eyes are being subjected to ten to twelve times as much light as they shoppingwatchswissarmy need. When shoppingwatchswissarmy glare reaches these levels, it can be painful. Sunglasses help eliminate glare by absorbing or reflecting light. How much light shoppingwatchswissarmy the lens can absorb or reflect depends on the darkness of the lens and its coating. The shoppingwatchswissarmy amount of light sunglasses should absorb depends on how and where one plans to use them. Discomforting glare this first level of glare usually starts at about 3,000 to 3,500 lumens. The unprotected eye''s reaction to discomforting glare is a slight squint. Discomforting glare can occur in any weather, including overcast days. Even this mild glare causes eye fatigue. Lighter eye colors tend to be more sensitive. When light reaches the intensity of about 10,000 lumens, it actually blocks vision.

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