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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 to which a pair of sunglasses belongs, you just look at the interior from the frame. Ranking varies from 0 to 4 based on European standards:

Category 0: Passes 80% to 100% of brightness. Clear or slightly tinted, ideal for outdoors and indoors 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 as well as in the city.
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). Ideal for high mountains and glaciers.

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

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The sunglasses with the CE mark comply with all requirements and directives, and provide adequate ultraviolet ray protection for that eyes. The CE mark often etched towards the inside of the frame and more specifically to one arm of the sunglass frame, shows compliance keeping the vehicle safe requirements according to EU directives. There is no independent body that inspects each model individually. However, the famous manufacturers of glasses are often voluntarily adhering to these standards because of their desire to preserve their global standing and to keep 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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