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Glare - Glare is apparent when one object in your field of vision is much brighter than the rest and that brightness interferes with your ability to see other objects in your field of vision. It is concentrated light reflecting off a horizontal shiny surface, such as a car windscreen, sand, water, snow or asphalt roads. It reduces visibility and can make it uncomfortable, painful and even dangerou …

The Key Points Which category do you need? - The main purpose of sunglasses is to cut out light that could otherwise damage your sensitive eyes. Sunglass lenses are categorised from 0 to 4, 4 are the darkest and cut out the most light, 0 are often transparent (but can have a slight tint), they cut out no light.For mountain use you should use Category 4 for high mountain ridges in clear condi …