Since 1995, United States regulation guarantees their filtering power. You will always have to choose CE marked glasses followed by a number from 0 to 4 indicating the degree of protection.
The CE2 glasses are suitable for the campaign The CE3 mention offers good protection but is not enough for the high mountains, the open sea, the Great South or the tropics, which require CE4 protection and an infrared filter.
Degrees of protection of the glasses (United States classification):
Class 0: clear or slightly tinted glass
These are usually the glasses of “aesthetic comfort”. This filtration category is very light and does not effectively protect against ultraviolet radiation when exposed to strong sunlight.
– Indication: Interior / Veiled sky
– The degree of protection: 0 to 20%
Class 1: Lightly tinted glass
This type of sun protection is recommended for situations of sunlight, such as in winter or very gray weather. This index is not recommended for massive exposure to strong sunlight.
– Indication: Attenuated solar brightness
– The degree of protection: 20 to 57%
Class 2: Mediumly tinted glass
This sunscreen will be effective in situations of the average Sun.
– Indication: Average solar brightness
– The degree of protection: 57 to 82%
Class 3: Dark glass
This sunscreen is effective in situations of high sunlight: at the sea, at the beach, or for winter sports.
Index 3 blocks 100% of the ultraviolet.
– Indication: High solar brightness
– The degree of protection: 82 to 92%
Class 4: Very dark glass
This sun protection is indicated in case of extreme sunlight such as for mountaineering on glaciers or in the high mountains because the brightness is increased tenfold by the reverberation on ice and snow.
Protection index 4 is prohibited for driving because you will not see anything if you go under a tunnel.
– Indication: Exceptional sunlight / do not wear to drive
– The degree of protection: More than 92%
Why protect yourself with your sunglasses?
Normally, with the presence of the sun, the iris decreases the size of the pupil which has the effect of naturally protecting our eyes from the aggressions of the sun. Even if the amount of light reaching the retina decreases, this natural filter is not enough. It is the UV that is responsible for the burning of the eyes. The UV comes from all sides of the eye, right left but also above or below, we must choose good glasses that cover the eye area.
Panoramic or side-shielded models prevent UV from reaching the eyes from the sides but sometimes result in optical distortion.
The solar filtration index of the UV Protection Sunglasses, therefore, corresponds to the filtration capacity of the sun’s rays, it must be chosen according to your situation.
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