1 ) Normally, 8 to 40% of the light can penetrate the sunglasses. Most people choose to 15-25 % of the sunglasses. Outdoors, most color Cheap Oakleys Frogskins Sunglasses Outlet glasses are within this range, but different manufacturers glasses light transmittance varies. Darker color glasses can penetrate 12% (outdoors) to (indoor) 75% of the light. Lighter brand can penetrate 35% (outdoors) to 85% (indoor) light. In order to find a suitable color depth and shading glasses, users should try several brands.

2) Although the color glasses for everyday use, but it does not apply to sports glare environments, such as boating or skiing. Sunglasses shading and color depth cannot be used as a measure of UV protection standards. Glass, plastic or polycarbonate lenses added ultraviolet absorbing chemicals. They are usually colorless, transparent lens even after treatment can also block UV light.

3) Color and shading the lens varies. Mild to moderate degrees of shading Discount Oakleys Flak Jacket Sunglasses Cheap sunglasses suitable for everyday wear. In bright light conditions or outdoor sports, should choose strong shading sunglasses.

4 ) shading gradient separation from the top in the end portion of the lens or descending order from the top to the middle. It can protect your eyes when people receive free view sky glare hurt, but still clearly see the following scene. The top and bottom double gradient lenses dark in color, the middle light in color. They can effectively reflect the water or snow glare, so we do not recommend using sunglasses while driving, because they make the dashboard blurred.

5 ) prescription sunglasses can be tailored according to their needs, Addition to adding ultraviolet absorbing substances, the lenses that can be added in the production process dyestuff. In addition to the coloring material, manufacturers have developed filtered light chemical substances that can absorb certain parts of the spectrum. They use a combination stain and filter material, developed dye sunglasses for specific sports, such as golf.

6 ) tinted lenses having different light filter. Most tinted lenses can block 70-90 % of the light. Part tinted lenses filter certain wavelengths of visible light only, while light of other wavelengths not filtered. Therefore, different color or dye may change the color deepening effect on the ratio. Some colors, such as pink, blue or purple purely for decoration only, the filtering effect of light is poor. The best way to choose is to hand tinted lenses Tiffany and Co Key Necklace Jewelry Outlet sunglasses, arms straight, against a white background to determine its color.