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VLT VLT, or visible light transmission, is the light that passes through the lens to reach your eye. For example, a dark tinted lens will have a low percentage of VLT, while a light tinted lens will have a higher percentage of VLT. FILTER CATEGORIES Category 0 Light transmission 80-100% • Colourless or very lightly tinted filter. Usually sports or protective eyewear designed to shield against wind, dust, or debris, but not against the sun. Category 1 Light transmission 43 - 80% • Very lightly tinted lenses, typically yellow or orange, suitable for lower solar radiation or protection against wind or dust. Category 2 Light transmission 18 - 43% • Medium dark filter suitable for moderate sunlight and casual wear. Their tint is slightly lighter than usual. Can be used for spring and autumn walks on sunny days. They will also be useful when driving and frequently moving between shade and sunlight. Category 3 Light transmission 8 - 18% • Dark filter suitable for intense sunlight exposure on the beach or in the city. This category is typical for most types of sunglasses. They are perfect for summer as they provide a higher level of protection against solar radiation than the previous category. Category 4 Light transmission 3 - 8% • Very dark filter for extremely intense sunlight. Sunglasses for the mountains or desert and anywhere the sun is not just extremely strong but also reflects a lot. These sunglasses should not be used for driving.
