Ultraviolet radiation (UV) refers to the low frequency light waves produced by the sun. There are three forms of UV rays: UVA, UVB, and UVC. UVC - The atmosphere filters UV-C, so it is not a real concern. UVA - The cause of sun related drug reactions. UVB - This type of UV is responsible for sunburn, prolonged eye damage, and most forms of sun related skin cancers. It can penetrate thin cloud layers and up to three feet of water. This is the one that will do the greatest damage to eyes. To provide adequate protection, look for sun glasses that absorb at least 99% of UV radiation. Choose sunglasses with one of the following indexes: 'Blocks 99% or 100% of UV rays' 'UV absorption up to 400nm' 'Meets ANSI UV...

Smoke, Gray and Gray-Green tints: The most common type of lens colour. Transmits all colors evenly without changing value of color. Light enough not to impair vision, yet dark enough to provide overall protection from glare. Excellent for bright sunny days. Grey tint is best for bright light situations like water sports because it blocks out the brightest of the suns rays. Dark Amber or Brown lens tints: A warmer, slightly brighter lens than the gray. Especially good at blocking the blue light commonly found in diffused light such as one might experience on a cloudy day. Brown/Amber can improve both contrast and depth perception, reduce glare and is a good all-around choice if you live in an area with changeable weather patterns. Brown is great for applications where distances need to be constantly judged, like tennis or golf or skiing or other sports requiring acute visual perception and contrast differentiation. Brown is also best for lower light situations, like fishing in the late afternoon or early morning. Brownish tint lens helps highlight the different contrasts in green colors and enhance visual acuity on the golf course. Yellow Lens Tints: So-called "Driving" lenses are usually amber or yellow-brown.improves contrast, reduces glare, perserves sharpness. High Intensity tint for maximum sight performance during low light driving. Excellent for Night riding, .overcast, haze, or fog conditions. The brightness of this lens makes it the choice of many mountainbikers, shooters and cross-country skiers. Yellow enhances contrast by filtering out the somewhat scattered, out-of-focus blue light...

Anti-Reflective Coating is a coating that can be applied directly to your prescription lenses. It has many benefits including reduction of eye strain during prolonged computer use, reduction of glare for night-time drivers, and reduction of white-light reflection on your lenses if photographed. Polarized lenses are effective cutting strong light, reflection and scattering light. it makes messy rays become parallel. TAC polarized lenses makes the scenery more clear and soft. and polarizing angle radians are gone though professionally design and producing, The wearers have no distortion of scenery and the feeling of Vertigo.so it is great for golfing, driving, boating, cycling, and running. Linearly polarized glasses To present a stereoscopic motion picture, two images are projected superimposed onto the same screen through orthogonal polarizing filters (Usually at 45 and 135 degrees). The viewer wears linearly polarized eyeglasses which also contain a pair of orthogonal polarizing filters oriented the same as the projector. As each filter only passes light which is similarly polarized and blocks the orthogonally polarized light, each eye only sees one of the projected images, and the 3D effect is achieved. Linearly polarized glasses require the viewer to keep his or her head level, as tilting of the viewing filters will cause the images of the left and right channels to bleed over to the opposite channel. This can make prolonged viewing uncomfortable as head movement is limited to maintain the 3D effect. Circularly polarized glasses To present a stereoscopic motion picture, two images are projected superimposed onto the same...

For all glasses,Lenses are basically a core and important components.The right lens can make life look clearer—even make you look better.So let's start from each one of these lens components or features and usage in more detail to learn. Polycarbonate Polycarbonate lenses are light-weight and thinner than traditional plastic lenses. Polycarbonate is also scratch and shatter resistant. Great option for sports eyewear, kids eyewear, and everyday eyewear. Acrylic Acrylic Lenses have the similarities feature with Polycarbonate,but there are still differences in performance in the areas of optical stability and impact resistance,this means just most of indexes cannot reach Polycarbonate to some extent for their innated similar feature,for example,the hardness and impact resustant level. TAC TAC lenses will be related with polarzing.and which is the core material for polarization.it will be thiner and lighter than Polycarbonate and Acrylic.and...