The following provides some very simple and feasible method:
1, under normal circumstances, cheap oakleys polarized sunglasses lenses are affixed with clear polarized lenses electrostatic material marked or labeled with polarized lenses on the product tag.
2, in the purchase of polarized sunglasses, polarized test piece for testing. On the part of the pattern of the test piece with the naked eye cannot recognize, through polarized lenses can be clearly identified.
LCD display principle through polarized lenses observation phone LCD screen, rotate the screen when the screen also with rotating the screen goes blank, is caused because the Polaroid filter the light of the screen in one direction.
Types divided according to the different role of sunglasses:
1, Lenses: It was also known as "photosensitive lenses. Because the chemicals added to the lens on the silver halide, so that the originally colorless and transparent lenses, the case of bright light becomes colored lenses do protection, it is suitable for indoor and outdoor use both.
2, anti-reflective protective lens: This lens is on the surface coated with a thin layer of magnesium fluoride to prevent light reflection, allowing you to see things more clearly and without light interference. To test your glasses really anti-reflective protective lenses, discount oakley sunglasses can be aligned light source, if you see purple green reflective, it would indeed coated with anti-reflective protective film on the lens. Some companies have patented technology multifunction lens (back-plated 8-layer anti-reflective blue film), so that in addition to with the traditional function of the lens, the lens is more anti-reflective, anti-fatigue, anti-glare and higher color contrast, you wear obviously feel the visual fresh, natural and comfortable visual sensitivity and brightly colored scene.
3 color lenses: also called "stained lens is the lens production process, coupled with some chemicals, so the lens showing the color, to absorb specific wavelengths of light. This is the most commonly used type of lens of sunglasses.
4, coloring the lens: This lens showing the effect color lenses is the same, only be made in different ways, it is the color applied to the surface of the lens, the most well-known is the "gradient-coloring cheap oakley sunglasses lenses, color above the deepest, and then down gradually shallow. There are degrees of sun glasses coloring treatment lenses.