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Is there obvious characteristics of polarized lenses? How do they look in comparison with normal lenses?.
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There should be a test card for polarized sunglasses you can buy from most optical stores. You can't see the image on the card unless with your polarized sunglasses. Or you can hold them up to a computer screen with the front of the lens facing the screen. When you rotate the lenses around, you are expected to find the lights reflected on the screen are alternated with darkness if the lens is polarized. -
Use two pairs of sunglasses and make the lenses cross at the angle of 90 degree .If you can't see things through them ,then it is polarized .Comment
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You can find a LCD (Liquid Crystal Display), let the glasses level at the screen, at this time, the lens has not any change. Then put the glasses clockwise rotation up to 45 angle, if you see the color of the lens becomes deeper, and when you turn back, it become normal, this is polarized sunglasses. If you turn it, there has no change, and then this is not polarized sunglasses. But you should note that it must be a liquid crystal display.Comment
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Polarized lenses can reduce glare and the intensity of ultraviolet light, and polarizing sunglasses can completely cut off glare caused by scattering, reflection. But it can not completely cut off those harmful lights. To know whether sunglasses are polarized, you can do like this. Generally speaking, there may be an obvious polarization lens material static on the sunglasses. What's more, using polarization test piece is a good choice to know whether sunglasses are polarized, the pattern on the polarization test piece can not been identified with naked eyes, while you can see clearly through polarizing lens. According to the LCD display principle, we can also identify whether your sunglasses are polarized. When you observe the LCD screen of your cell phone through polarizing sunglasses, you can see the blank screen when you are rotating the cell phone.Comment
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