The main color Cheap Mac Cosmetics Makeup wholesale Outlet glasses lens discoloration membrane, is the use of light-sensitive material for forming an organic film layer of color, and this resin layer coating the lens surface is the lens surface or penetration into the resin, so as to achieve color effects, characterized in that: lens background light, indoor almost colorless, color is not affected by the degree of speed. The most representative is the transition (Transitions) the company's color technology, life expectancy is longer, usually 3-4 years. Color glasses for patients that can correct refractive errors, can also act as sunglasses outdoors, isolated ultraviolet light, adjust the light entering the eye, maintaining proper vision; status regardless of their color, it is always good to absorb ultraviolet light. Several of the major indicators of color film, color life, color speed, color uniformity. Domestic brands more color film, color film, but the main problem many domestic slow lens discoloration, fading slowly, deep color, color is not exactly easy, especially after wearing for some time, will find life color, color speed, color uniformity decline the more serious. Better the performance of well-known brands, mostly by the United States and France Corning Transitions color film technology. For example, the Japanese have adopted nikon Transitions discoloration technology. The fifth-generation ESP color film of the film composite technology is more mature, noble plated high permeability layer, its interior visual effects more clearly than ordinary hard lenses. Color depth also improved, less dependent on temperature, at 23 degrees Celsius sunshine comparable sunglasses in high temperature environments, can get other color than the current product shades deeper outdoor visual effects. And color fade faster than the first generation of Transitions Fake Oakleys Frogskins Sunglasses Cheap for Sale lenses faster. First, the principle of color glasses Currently used photochromic lenses are divided into two kinds: the base color lenses and film color lenses. Lenses base comes mainly from light-sensitive material mixing glass lenses, color lenses by French glass version Corning Incorporated (corning) first developed successfully, the principle is the use of ultraviolet light-sensitive silver halide (usually silver chloride) microcrystalline implantation of ordinary glass material, which is characterized by lens background darker indoors will be showing a hint of gray or brown. Speed of color lenses by, the higher the degree of color change more slowly, when the thickness of the lens is not the same, the color of concentration also will be different - a high negative lens edge thicker than the center, thus increasing the density of the color at the edges is also. High density is very easy to identify the color, light color, high refractive power leads to the phenomenon of the center, and the periphery of the ribbon has a very deep. Impact on the positive lens on the contrary, the middle area very dark, and the surrounding light color. High hyperopia can find the central lens look out too affected. Since the light-sensitive material is mixed into a glass material, resulting in a shorter lifespan color lenses, usually in about 1-2 years (the life of the president of some imported materials), to be followed by the Cheap Ray Bans Wayfarer Sunglasses Outlet Sale lens and change the background color occurs between the deepest the difference is reduced, the final color is not. Most of the photochromic material of gray and brown, graying and tea becomes known, other colors may also be obtained through a special process. All the glasses, including single light, double light, gradient lens can be manufactured using a photochromic material. In recent years, the development of light-induced discoloration of resin lenses faster, currently on the market is the most commonly used material for the refractive index of the resin discoloration 1.50,1.56,1.59 (PC material), 1.67, and so on. Second, the color glasses Material A glass and a resin material of the light-induced discoloration of the main difference is that between the manufacturing process. Glass photochromic lenses will change color material - silver halogen, mixed together with the glass material is dissolved, through the lens blank manufacturing; while resin photochromic lenses change color substances introduced methods are mainly two kinds of coating and surface penetration. The best way is to surface penetration method. The manufacturing process, the photochromic material can be accurately controlled penetration into the front surface of the lens ~ 150 | ìm. Will determine the uniformity of penetration of the final performance of the lens' surface "applies to any kind of penetration of the refractive power of the lens, have the same performance of a uniform color effect does not occur in the glass photochromic Tiffany and Co Key Necklace Jewelry Outlet lenses color uniformity.