The level of danger encountered while exposed to solar radation varies in accordance with several interconnected geophysical factors.
More specifically, the level of solar radiation exposure will increase or decrease depending on the thickness of the ozone layer in the atmosphere (which acts as a natural filter), the season, and the angle of incidence of the sun's rays at that particular moment of the day. It should be noted that exposure to solar radiation is 25% higher at the autumn equinox than at the spring equinox when the ozone layer is thicker.
The ozone layer varies in thickness depending on where you are in world, and therefore offers differing degrees of protection. The amount of radiation varies as the sun's position changes during the course of the day. The risks linked to light will therefore also vary.
The angle of incidence of the sun's rays when they penetrate the ozone layer has a direct effect on the amount of filtration provided by the ozone. It is for this reason that radiation is strongest between 10 am and 3 pm, when the sun's rays are less diffused.
Julbo has developed a range of products specially adapted to these extreme conditions. They are made with Category 4 lenses, wraparound frames and protective side shields. Check out our mountain collection here.