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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 watchessale by absorbing 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 in any weather, including overcast days. Even this mild glare causes eye fatigue. Lighter eye colors tend to be more sensitive. When light reaches the intensity of about 10,000 lumens, it actually blocks vision.

Because our eyes can''t cool themselves easily, ir rays cause eye fatigue and dry up our eyes'' natural moisture. Sunglass lenses protect watchessale the eyes from the effects of ir by absorbing the radiation. This may be beneficial watchessale to people watchessale 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 watchessale rays ultraviolet rays have shorter wavelengths and more energy than visible light rays. They can have a harmful effect on the eyes immediately watchessale 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 (like sand, snow, or water). They are also strongest at midday.

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 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, including watchessale 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. At all stages, they improve contrast. These lenses are excellent for any outdoor action sport like skiing, sailing, or tennis. Gradient these lenses are darker at the top of the lens and get progressively lighter at the bottom.

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