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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 need. When glare reaches these levels, it can be painful. Sunglasses help eliminate glare shoppingwatchesswissarmy by absorbing shoppingwatchesswissarmy or reflecting light. How much light the lens can absorb or reflect depends on the darkness of the lens and its coating. The 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 shoppingwatchesswissarmy in any weather, including overcast days. Even this mild glare causes eye fatigue. shoppingwatchesswissarmy Lighter eye colors tend to be more sensitive. When light reaches the intensity of about 10,000 lumens, it actually blocks vision.

Glass is more scratch-resistant, than plastic. Cr-39 optical quality plastic, made of hard resin, is considered the best plastic for lenses. It weighs shoppingwatchesswissarmy half as much as glass, which means it is not heavy on the face. It exceeds fda requirements for impact-resistance because of its comparatively loose molecular structure. A remarkably strong plastic - in fact, aircraft windshields, motorcycle windshields, and sport safety glasses are made of polycarbonate because it is so strong. Compared to cr-39 and glass, polycarbonate plastic weighs the least and is the most impact-resistant. 20 times more impact resistant and 3 times lighter than glass. A good choice for those who want really rugged sunglasses: for people who engage in outdoor activities and fast-action sports. Polycarbonate is widely used, and is considered the second optical plastic. Its major drawback is that it is soft and susceptible to scratching and abrasion. It must shoppingwatchesswissarmy be hard-coated to raise its scratch-resistance to that of cr-39.

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