Five different levels of protection are usually distinguished by the color of the lens. The table below gives you an overview of the different glasses options and types that apply to each particular condition.
Category 0 | Bright or particularly bright | Light absorption rate: 0-20% | Suitable for insect or windproof |
Category 1 | Bright to semi-dark | Light absorption rate: 20-57% | Suitable for cloudy days and a small amount of sunlight; strong contrast |
Category 2 | Dark | Light absorption rate: 57-82% | Suitable for normal sunlight, as in summer |
Category 3 | Especially dark | Light absorption rate: 82-92% | Suitable for winter sports, in the mountains or on the beach |
Category 4 | Extremely dark and/or reflective coating | Light absorption rate: 92-97% | Suitable for use on icebergs, on water or in the desert (but not for driving!) |