The risk of blue light for the eyes is often compared to the screens of smartphones, computers and television. However, this light does not only exist because of the screens, but also naturally. In this state, the risks would be underestimated, especially in the mountains, as recalled by the National Association for the Improvement of Eyesight. This reminder is not trivial as school holidays continue in France and many French people go to winter sports. "We forget that this natural blue light can generate visual fatigue due to strong glare and cause perception problems, especially since UV radiation doubles in intensity at altitude," said Dr. Jimmy Mohamed Monday in Sans Rendez you on Europe 1.
Snow reflects a large part of the radiation
The intensity of ultraviolet radiation, measured by the UV index, thus increases by 10% in steps of 1,000 meters in the mountains. In addition, snow reflects 40 to 90% of the radiation. At altitude, it is therefore more intense and more reflected, even in overcast weather.
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To protect yourself from blue light and UV, it is not surprising to wear sunglasses or a ski mask. However, this may not be enough if you do not make sure that the glasses or mask protect from glare. For this, the lens tint must be of category 3 or 4.
Wearing glasses recommended outdoors for children
The latter must also guarantee UV protection, which is generally certified by a mention on the branches or a label. As for children, whose eyes are more fragile, wearing glasses or a mask should not be limited to the practice of skiing, but concerns all outdoor activities.