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About Polarized Sunglasses
What are polarized sunglasses? Polarized sunglasses are designed to reduce the glare especially from the surfaces like water, snow, and glass. It is commonly used in sports such as driving and fishing by helping the wearers in these activities to see more clearly, allowing for the avoidance of potential hazards. Since light is made up for waves travelling in different directions. Vertical light is useful to the human eye. It help us to see. However horizontal light simply creates glare. Glare is concentrated light reflecting off a horizontal shiny surface, such as a car windscreen, sand, water, and snow or asphalt roads. It reduces visibility and can make it uncomfortable, painful and even dangerous to carry on driving, cycling, skiing or just sunbathing.

As we all know that we see by virtue of the light that enters our eyes in sunny days. Without good sunglasses, brightness and glare results in a loss of visual performance, which is produced when an object or light source in the field-of-vision is brighter than the amount of light to which the eyes are adapted. Most sunglasses will provide some absorption to dampen brightness, but only polarized sunglasses can effectively eliminate blinding glare. However, polarized sunglasses are not recommended to pilots. Polarized lenses eliminate reflected glare from a flat surface. However, looking through a laminated aircraft windscreen, while wearing polarized lenses can result in a reduced retinal image. Also some windscreen of aircraft is already polarized, hence polarized sunglasses result in double polarization. Moreover, some 3-D movies also use polarizing lenses. Usually one lens is horizontally polarized and the other one is vertically polarized, so that each eye sees a slightly different version of the movie screen. The eyes attempt to reconcile the two images for the brain, and the result is the illusion of a three dimensional image. Experimenters with several spare pairs of 3-D glasses lying around can play with the effects of polarization for themselves.

Since we have already know the usage of polarized sunglasses, how do I know if my sunglasses are polarized? If you have the same doubt, you can just look through the glasses at the reflection of any object on a window panel. Then, turn the sunglasses around as if they were the hands of a clock facing you. If the intensity of the reflection doesn't change with respect to what you see through the window, they are not polarized. Another way is to hold them at 90° to another pair labeled as polarized and if the lenses go dark where the lenses overlap, then your sunglasses are polarized too. If there’s no change, your lenses aren’t polarized. Moreover, not all polarization is equal. Because not all polarized sunglasses block glare as well as they should. A polarizing filter is no guarantee of an effective glare-blocking lens. It depends on the quality of the filter and how the lens has been produced. Cheap polarized sunglasses may only cut out 10% of reflected light, but many people don’t realize there is a difference in filter quality in better made glasses. For example, Julbo’s Polycarbonate Polarized lenses cut out around 60-70% of reflected light, and ther NXT Cameleon, Octopus and Polar HD lenses cut out 99% of reflected light.

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