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To prevent scratches, never use your fingers or fingernails to remove a spot on the lens surface, and never clean your sunglasses with a rough fabric such as wool or denim. More than likely, they''ll get scratched. Small or delicate faces with thin hair, lips and, eyebrows should choose smaller, delicate frames and citizenonline vice versa. Short faces can be made to look longer in a high-placed, light-colored temple. Long noses or wide-set eyes look best with citizenonline a heavy, dark bridge that sits low on the nose. Small noses or close-set eyes look best with a high, thin, light bridge. Rimless styles are also flattering. Wide nostrils look best with a wide keyhole bridge (an open space at the bridge area). Close-set eyes appear further apart when paired with frames that are light or clear in the nose area. Eyes that are set far apart benefit from frames that are darker in the nose area and have a wider bridge.

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 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 citizenonline 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.

Each lens citizenonline color citizenonline serves citizenonline a different function for the wearer. For example, brown makes details clearer; gray produces the truest colors and reduces glare. Brown and amber brown and amber-brown are excellent for general-purpose sunglasses. They improve contrast by filtering out blue light and reduce glare. They are the ideal lens color for sports with high glare such as skiing, citizenonline boating, and fishing and are well suited for driving and fast-reaction sports. Light amber-brown lenses can also be used in overcast, hazy conditions. Gray is a neutral shade and a good general-purpose color. Colors pass through gray lenses evenly, allowing true perception and the least amount of color distortion of any lens color because it does not enhance contrast, an important feature for sports such as golf, cycling, and running. Gray lenses protect well against glare, making them excellent for sports, outdoor work, and driving, as well as general wear citizenonline.

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