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Glass is more scratch-resistant, than plastic. Cr-39 optical quality plastic, buy made of hard resin, is considered the best plastic for lenses. It weighs 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 watch structure. A remarkably strong plastic - in fact, aircraft windshields, motorcycle windshields, and sport safety glasses are made of polycarbonate because it is so buy 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 watch and buy sunglasses: for people who engage in outdoor activities and fast-action watch sports. Polycarbonate is widely used, and is considered the second optical plastic. Its major drawback is that it is soft and susceptible buy and watch to scratching and abrasion. It must be hard-coated to raise its scratch-resistance to that of cr-39.

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 buy effects of ir by absorbing the radiation. This may be beneficial to people who wear contact lenses whose eyes tend to dry out easily. It is important to note that there is no scientific evidence to indicate that ir rays are harmful. Different ultraviolet rays ultraviolet rays have shorter wavelengths and 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 watch (like sand, snow, or water). They are also strongest at midday.

Enter here - Click here to go to our online catalog of watches. We have the best selection of brand name watches and accessories.

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