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Ray ban polarized sunglasses made use of this one property which is called polarization. Light source in general produces waves that are able to travel in every direction. When light is reflected from a particular surface, for instance water and glass, these waves are polarized normally in x-axis (horizontally).
Therefore, polarized sunglasses are introduced. This type of sunglasses consist of high quality polarizing lens in vertical which serves the purpose of reducing the brightness of light and at the same time allows the user to have a clearer vision. Besides that, it prevents harmful components from affecting the eyes such as ultra violet rays.
It is commonly used when the user needs to have a clear vision under the bright glare of sun. Bright light tends to cause irritation to human eye. Although normal or conventional sunglasses are able to block the glare, the effectiveness of them is lower because it tends to block detailed stuff which needs to be seen. This could be very harmful and dangerous towards the user.