More than likely you've come across a pair of sunglasses that come with the option of having polarised lenses or not.
Do you really need polarised sunglasses? Does polarisation make your sunglasses more effective? Are you damaging your eyes by choosing non-polarised lenses?
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In fact, what is the difference between polarised sunglasses and non-polarised sunglasses?
Depending on what you need your sunglasses for the difference that polarisation makes can be huge, but really the answer is more simple than you think, and will hopefully inform your decision next time you're shopping for a pair of shades.
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