With so many varieties of shapes, colors, price is not always easy to find with the sunglasses. Choose a good UV index is a good start, but other criteria are to be added to adequately protect his eyes and be comfortable in all conditions.

CE

The filtering sunglasses are guaranteed by an EU regulation. He must choose his sunglasses glasses with CE mark followed by a digit from 0 to 4 indicating the degree of protection like tom ford sunglasses, Oakley, etc.

CE2 glasses are suitable for the campaign. The reference to CE3 offers good protection but it is essential to choose a protection CE4 and an infrared filter for the high mountains, the sea or the tropical sun.

More details on the degrees of protection sunglasses

What are the risks?

If your eyes are not protected properly, you may have an ophthalmia, that is a burn of the cornea. The symptoms are red and watery eyes and itchy eyes. This condition can become chronic and may even damage the cornea irreversibly.

Poor sun protection also leads to a risk of recurrent conjunctivitis, edema or early cataracts.

The shape of the glasses

For UV rays do not pass through the side, they should choose to form a wrap. This is especially recommended for water activities or in the mountains because the reverberation returned by the water and snow is very important.
For the high mountains, it is advisable to provide a pair of sunglasses (ex: tom ford sunglasses, Oakley, Ray-Ban, Maui Jim) on the closed side (like glasses glacier).

In the mountains the rays are less filtered by the atmosphere and the amount of UV increases 4% every 300 meters.
To choose the form in your body, see her glasses to choose according to the shape of her face.