Sunglasses-use can be divided into sun mirror, light-colored Fake oakleys frogskins sunglasses cheap for sale sunglasses, and three types of special purpose sunglasses.
The so-called sun mirror, suggests that it is for shading purposes, people rely on regulation in the sun often pupil size to adjust the flux, when the light intensity of more than ability to regulate the human eye, it will cause harm to the human eye. So in outdoor activities, especially in the summer, many people are used to block the sun visor mirror to reduce eye fatigue or adjust the light stimulation caused the damage.
Light-colored sunglasses blocking effect of sunlight on the inferior sun mirror, but its rich colors, suitable for use with all types of clothing, has a strong decorative effect. Light-colored sunglasses because of its rich colors, styles, by the young people of all ages, female fashion is fallen in love with them. Special purpose sunglasses block the sunlight has a strong function, commonly used in beach, skiing, hiking and other outdoor more intense sunlight, and its UV performance and other indicators have higher requirements.
Labeled as "uv400" defense sunglasses can reach the level of more than 90% of UV, the lens has been specially processed, can block the ultraviolet wavelengths shorter than 400nm. Can choose to wear contact lenses contact lenses with anti-ultraviolet function, and can filter out 90% of ultraviolet rays, and then wear sunglasses, even higher level of security.
Protective effect of colored lenses
(1) Brown Series: brownish lenses Tiffany heart necklace jewelry outlet can absorb light in the violet, blue, absorbs almost 100% of the ultraviolet and infrared. Pastel shades, so that the eyes are less likely to fatigue. Is a very good protective lens.
(2) Gray: fully absorb infrared light, and most of the ultraviolet light, and will not change the color of the original scene. Gentle natural color is quite popular lens choice.
(3) Green: Department of glasses and gray, like all alone absorbs 99% of infrared and ultraviolet light in the blue, red can also be blocked, but sometimes the color of the scene after the green lens will be changed. But because the green to bring people feel cool and comfortable, also good for eye protection, and is therefore an excellent choice for sunglasses lenses.
(4) Red: Red lenses block UV and infrared effects and comparison of these three, it is slightly inferior, for some relatively short wavelength light barrier better. Lens color pastel pink, for some wearers, the psychological effect is substantially larger than helpful.
(5) Yellow: Yellow lenses can absorb 100% of UV rays and most of the blue, after absorbing blue light, the scene will be seen more clearly, so that we can find, hunt, when to shoot, when to wear yellow lenses filter Cheap Ray Bans Wayfarer 2140 Sunglasses Outlet is very common.