Sunglasses lenses depends on the eye of the good and bad

Cheap oakley sunglasses lens color determines which part of the absorption spectra of the lens. Use different colors to produce a specific effect.
1, gray is a very good general color, while reducing the brightness, the color distortion is minimal. Grey lenses provide glare protection, makes it the ideal choice for driving and general use.
2, yellow or gold lenses can reduce blue light, while allowing other frequencies of light passes through the lens. Because Blu-ray can bounce and spread a lot of light, which can result in a known as the blue haze of glare effects. In fact, yellow elimination of the blue part of the spectrum, thus making all objects appears bright and clear. This is why sunglasses prevent snow blindness is generally yellow. These colors make the color perception a bit distorted, thus such colors sunglasses does not fit for activities that are needed to properly identify the color.
3,Amber and Brown cheap oakleys are also good universal color. They can reduce the glare effect, in addition to ultraviolet rays, its unique molecules can absorb higher frequencies of their colors, such as blue. Studies have shown that long term near-ultraviolet light (such as blue and purple) illumination, is one of the cataract risk factors. In fact, Sun Tiger has a special version called the Blue Blockers, owns the patent. Like sunglasses with yellow lenses of this type may result in color distortion, but increases contrast and clarity.
4, green lens filter blue light, also reduce glare effects. All color lenses; green lens provides maximum contrast and maximum sharpness, so popular.
5, in the context of green or blue, Purple/Rose lenses provide the best contrast of objects. So they are a good choice for hunting and skiing.
Many sunglasses manufacturer uses something called constant-density technology to lens dye. It is the oldest sunglasses manufacturing process, the entire glass or polycarbonate material has the same color of the mixture. Thus in the process of manufacturing lenses, the color is inside the lens. A layer of light-absorbing molecules in pure polycarbonate-coated surfaces is also a method of dyeing. Polycarbonate oakley sunglasses cheap lens dye most often used method is to immerse the lenses in a special liquid that contain coloring substance, coloring substance will slowly absorbed through the plastic. If you want a darker, just extend the lens immersion in liquid.