What kind of lenses provide the best protection from the sun's rays?

宁夏眼镜

There are three kinds of sunlenses: standard or normal, polarized and photochromic. Polarized lenses not only protect the eyes from radiation but also help screen out glare and can improve visibility, especially on sunny roads, on highly reflective water surfaces, etc. Photocromic lenses automatically adjust the filtering power of the lenses under different conditions, based on the amount of UV rays contained in solar radiation. This kind of eyewear is convenient because it can be worn all the time, indoors and out.


Mirroring involves a coating process applied to lenses and can be useful in high-intensity light situations, as occur at high altitudes and on snowfields or glaciers. Colored lenses can also ensure the same protective effects. Lenses also differ in terms of screening power. For example, in town or at sea level, light conditions are quite different from those found in the mountains or in snow, where greater screening power is required, both for the eyes and for the skin. This means it is also important to check the filtering power of lenses, which is based on a scale defined in another European standard: En 1836/97.


Lens Categories and Descriptions of Use:
Cat. 0 - 1 for interior environments, fashion accessories, or for use on dark days without strong light (wind protection). Transparent or provide weak or light filtration
Cat. 2 for average light conditions, cloudy skies, in town, etc. average filtration
Cat. 3 general use in full sun, dark filter
Cat. 4 for use in very bright light, mountaineering, highly reflective surfaces, etc. very dark filters (not safe for driving!)