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Category 4 Sunglasses

Category 4 Sunglasses

All models in this section have dark category 4 lenses in grey or brown tints. Category 4 lenses let in less than 8% of light – this makes them suitable for activities like skiing, mountain climbing, high altitude walking and desert trekking: conditions where high glare or intense sunlight is experienced. They are also suitable for eyes that are very sensitive to any sunlight. Lower down the page is more information about lens categories.

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The lens tint category number for eyewear equates to a percentage of the VLT (Visible Light Transmission) – basically how much light the lens lets through, as follows:
Category 0: 80-100% VLT
Category 1: 46-79% VLT
Category 2: 18-45% VLT
Category 3: 8-17% VLT
Category 4: 3-8% VLT
The following is a general guide to the Categories that apply to different lens colours:
Category 0 – Clear lens
Category 1 – Light yellow & pale orange
Category 2 – Orange, rose, red, amber & light brown
Category 3 – ‘Standard’ grey & brown sunglass lenses
Category 4 – Dark grey & brown sunglass lenses
Almost all the grey and brown lens sunglasses sold on the Sunglasses For Sport website are Category 3 and suitable for use in strong sun conditions.  Category 4 lenses are always clearly identified because they have specific uses e.g. high altitude walking, climbing and skiing. They are also good for anyone that has eyes sensitive to bright light but it’s important to know that you mustn’t use Category 4 lenses for driving (they are too dark for driving).