What is the difference between polarised sunglasses and UV400 sunglasses?

Why should we wear sunglasses? What are UV rays? Ultraviolet radiation is a type of light that is not visible to the human eye, and is part of the rays that reach us from the sun. Excessive exposure to UV Rays can result in the front surface of the eye becoming damaged, much like sunburn on the skin. Without proper precautions, these rays can also have harmful cumulative effects that may develop over time. Too much exposure to UV rays may result in one or more of the following eye…

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