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The lenses automatically lighten or darken according to the sun''s brightness. Silver halides, which are part of the glass, darken the lens when exposed to ultraviolet rays. Photochromic lenses must be conditioned through several exposures to the sun. After that they swissarmybasecampwatch will darken fully. They can be worn indoors or outdoors. Most photochromic lenses are gray, but they are also available in green, brown, and other colors. They are also called changeable, sun sensors, and photograys. All-weather photochromic these lenses work well under all weather conditions, swissarmybasecampwatch including overcast and hazy days. On overcast days, they are light amber and improve contrast and sharpen details. In sunshine, they turn dark brown; when it''s cold and bright, they are gray/brown. swissarmybasecampwatch At all stages, they improve contrast. These lenses are excellent for any outdoor action sport like skiing, sailing, swissarmybasecampwatch or tennis. Gradient these lenses are darker at the top of the lens and get progressively lighter at the bottom.

Classic ovals are a perfect choice. Oblong–round, square, widens and shorten the face with styles that don''t extend beyond the widest part of the face. Wear round or square shapes. John lennon/annie hall style frames will look great on this face. Frames with short horizontal and long vertical lines also work. Decorative or contrasting temples add width to the face. Triangle–frames with a straight top line. Cat eyes this face shape has a wide jaw and a narrow forehead. Soften the lower portion of the face by accenting the eye area. Temples should be placed high. Frames can be top heavy and angled inward at the bottom. Styles such as cat eyes should angle outward at the top corners and be wide enough to balance the jaw line. You can also try metal frames with rimless bottoms. Heart–very light colors and rimless styles minimize the upper portion of the face by choosing frames no wider than the forehead and angling outward at the bottom corners.

Because our eyes can''t cool themselves swissarmybasecampwatch easily, ir rays cause eye fatigue and dry up our eyes'' natural moisture. Sunglass lenses swissarmybasecampwatch protect the eyes from the 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 swissarmybasecampwatch standards for how swissarmybasecampwatch 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 (like sand, snow, or water). They are also strongest at midday swissarmybasecampwatch.

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