Category 4 Sunglasses

Category 4 Sunglasses

Category 4 sunglasses have dark lenses for use in extreme sun conditions where high glare or intense sunlight is experienced. Category 4 lenses let in less than 8% of light – this makes them suitable for activities like skiing, mountain climbing, high altitude hiking and desert trekking. Also available are photochromic sunglasses (light adjusting) with lenses that darken to category 4 in intense sun/high glare conditions. Category 4 lenses are also suitable for eyes that are very sensitive to sunlight. Lower down the page is more information about lens categories.