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The sunglass lens tint reduces visible light and offers effective protection against sun glare. Renowned manufacturers ranked lenses into different categories depending on light conditions. To obtain the category that a set of sunglasses belongs, you just look at the interior of the frame. Ranking varies from 0 to 4 according to European standards:

Category 0: Passes 80% to 100% of brightness. Clear or slightly tinted, ideal for indoors and outdoors with cloudy weather.
Category 1: Passes 43% to 80% of brightness. Slightly tinted glasses: the perception of the luminosity is reduced. Good for cloudy days and in the town.
Category 2: Passes 18% to 43% of brightness. Moderately tinted lenses: light perception average. Particularly suitable for summer.
Category 3: Release 8% to 18% brightness. Dark glasses: strong sunlight. Very ideal for southern climates, water reflections, beaches and mountains.
Category 4: Passes 3% to 18% light. Very dark glasses: exceptional solar luminosity (not advised for driving). Well suited for high mountains and glaciers.

UV filtering occurs through appropriate lenses regardless of the level of "darkness" of the tint. It's not necessarily the darkest glasses that best protect the eyes, but sunglass lenses created using materials of high quality, high capacity UV-ray filters.

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The sunglasses using the CE mark comply with all requirements and directives, and provide adequate ultraviolet ray protection for the eyes. The CE mark often etched towards the within the frame and more specifically to 1 arm from the sunglass frame, shows compliance with safety requirements in accordance with EU directives. There is no independent body that inspects each model individually. However, the famous manufacturers of glasses in many cases are voluntarily complying with these standards because of their desire to preserve their global standing and also to maintain their reputation intact. You may also look for yourself the validity of this mark by consulting a specialist within the optical world or just an optician.
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