How to choose your sunglasses?

First and foremost, know when and where you will wear them most often (sea or mountains, summer or winter, Nordic or tropical countries?)

choose the type of lenses:

mineral: they scratch less but are sensitive to impacts.

organic: they are lighter and impact-resistant but more prone to scratches.

Whatever their type, they must meet the same quality requirements as optical lenses.

choose the treatment:

Photochromic, which darken as light increases, and vice versa,

Mirrored, on filtering substrates,

Gradient, from darkest to lightest,

Polarizing, which eliminate blinding reflections on water, snow, …

Choose the color of the lenses:

Each tint has its own particular quality. It is also a matter of taste and comfort (knowing that blue or pink tints alter color perception). The tint of light signals must be respected for driving. And one must not forget that a tinted lens does not necessarily mean a well-filtering lens. 

"CE" marking 

Since July 1st, 1995, a European regulation has been in force across the entire European territory. It precisely defines the essential health and safety requirements for solar lenses. These are classified into 5 categories (from 0 to 4) and bear the "CE" marking.

Products meeting these requirements are authorized to be placed on the European market. The minimum obligations are stricter the higher the category. This is an important guarantee for the consumer, but it remains insufficient.

In summary, what are good sunglasses for?

To protect the eyes.

To filter UV rays to the maximum.

To selectively filter infrared rays.

To filter blue light.

To respect colors as faithfully as possible.

To protect the eyes against projections and impacts, and of course, they must always offer good optical quality.

Warning: they are insufficient in certain situations, such as in tanning beds or when observing a solar eclipse.