For the windows of the soul - the eyes, in addition to outside painted cream, wearing Cheap Ray Bans Wayfarer Sunglasses Outlet Sale sunglasses is the most simple and effective method of protection. Strong sunlight will not only eye fatigue, decreased visual sensitivity, and the sun's ultraviolet rays damage the eye lens bigger, especially in recent years the destruction of the ozone layer in the atmosphere, more so the impact of UV on the march of the human eye is increasing. Therefore, the appropriate choice of sunglasses for eye protection is essential.
Raiders: choose high quality lenses
When buying sunglasses, first check the quality of the lens. Note that in the choice of the lens surface should be smooth, no wear marks, bubbles, lens flat, horizontal direction from the point of view of the lens without warping. You can get sunglasses at 45 cm away from the eye through the glasses look around the vertical and horizontal lines, such as window frames or door frames, etc., and then move back and forth up and down the glasses. If found to distort or circumstances swing straight, indicating that the lens distortion, not to buy. There are signs of uneven or bubble Fake Oakleys Frogskins Sunglasses Cheap for Sale lens, can cause dizziness, discomfort, and it is not to buy after wearing.
Generally, the lens material can be simply divided into a glass, CR39 (optical resin), PC three. In addition to the normal glass filter better spectral features, the stability in the face of strong sunlight is higher. But sunglasses glass not only the degree of plain lenses and lens color when manufacturing had decided not changing color. CR39 is the addition of glass, preferably a lens material, the material is also the most widely used at present. CR39 scientific name is an optical resin, a variety of color changes, also stained with prescription lenses, light weight, changing, easy to break, fog resistance, so by the Members list. PC is part of a cheaper material, usually higher than the quality of insecurity, although the lens color is also changing, but if encountered strong sunlight, but can not filter UV rays, but because the light dimmed to make the pupil larger, allowing ultraviolet eye burns more serious.
Raiders II: Lens Color talking about science
Choose sunglasses summer color standards are: the lens should be able to pass through 30% of visible light, gray and green for the best, so that not only can withstand ultraviolet radiation, and the best visual clarity, perspective color change is also the smallest external objects. Protective effect of various colors are also different:
A, brownish: Cheap Mac Cosmetics Makeup wholesale Outlet lenses can absorb light brownish in purple, blue, almost 100% of the absorbed ultraviolet and infrared. Pastel shades, so that the eyes are less likely to fatigue. Is a very good protective lenses.
Second, the gray line: fully absorb infrared light, and most of the ultraviolet light, and will not change the color of the original scene.
Third, the green line: the same glasses and gray lines can absorb 99% of all the 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, so it is a great choice of sunglasses lenses.
Fourth, Red: Red UV blocking lenses and infrared effects and comparison of these three, it slightly inferior, for some relatively short wavelength light barrier better.
Five Yellow: Tiffany and Co Key Necklace Jewelry Outlet Yellow lenses can absorb 100% of UV rays and most of the blue, after absorbing blue light, the scene will be seen more clearly.