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Glass is more scratch-resistant, swissarmywatchdiscount than plastic. Cr-39 optical quality plastic, 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. swissarmywatchdiscount 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 be hard-coated to raise its scratch-resistance to that of cr-39.
Minimize swissarmywatchdiscount the curves and add definition swissarmywatchdiscount with soft, angular, rectangular styles. swissarmywatchdiscount Higher temples will create a longer profile. Glasses with brow bars also pull the eye upward, making the face appear longer. Diamond–oval, square, and rimless. This swissarmywatchdiscount face shape has wide or high cheekbones with a narrow forehead and chin. Oval glasses will soften the contour of the face, although softly curved square frames will work as well. Make sure the styles are no wider than the top of your cheekbones. Combination swissarmywatchdiscount frames (a plastic brow bar with a metal rim) are a good choice because they widen the forehead and minimize the temples and cheekbones. When all else fails, try rimless frames. Square–oval, round, cat eyes to reduce the angles of the square-shaped face with its strong swissarmywatchdiscount jaw line, broad forehead, and wide cheekbone; use soft, curvy styles that will give the face some definition. Higher temples or cat eyes will lengthen the face.
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