The solar spectrum consists of three wavelength families:
They are not perceptible by the eye. They are nevertheless the most harmful and are divided into 3 types:
“UV400” appellation guarantees a 100 % protection against these radiations. However, the proportion of UV increases according to the solar intensity radiation. Altitude, light and reflection play a crucial role in choosing the appropriate lens.
It corresponds to different eye visible colours and breaks down as following:
Imperceptible, they are responsible for a warming and drying phenomenon. Although not very dangerous, they can cause some damage to the eye, following a too intense sun exposure