Polarised Sunglasses Explained

Polarised sunglasses cut glare better than ordinary sunglasses, and here's why...
Ordinary sunglass lenses work by simply cutting down, by means of tinting, the amount of light transmitted through them. For example, a Category 3 lens intended for use in very bright conditions may reduce the light passing through it by around 80%.
Visible light is made up of both horizontal and vertical light rays, and the horizontal rays when bright enough tend to be seen as glare.
Polarised lenses (or 'polarized' across the Pond) filter out all the horizontal light rays, including those reflected off horizontal surfaces, such as water and wet roads. The lenses don't just dim these rays down, like conventional shades do - they cut them right out.

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