By removing the appearance factor and style from the conversation, attention is focused on the quality characteristics of lenses. It is true that quality has been identified with the absorption of UV radiation, but this is only one of the characteristics we are seeking from our sunglasses.

The sunglasses that will be placed in front of our eyes should offer protection, comfort, clarity and clarity throughout their range as well as be safe and durable. Unfortunately, very few sunglasses offer all of this to the fullest extent, but it is also important to “match” the characteristics of the lens with the habits, hobbies or profession of the wearer.

Nevertheless, very quality lenses are necessary:

• reduce visible light sufficiently to significantly reduce discomfort in glare and fatigue
• absorb ultraviolet radiation entering the eye, including from oblique directions (using rear anti-reflective coatings), especially in environments with increased solar radiation intensity.
• control the amount of HEV (or blue) radiation reaching the eye, as it has been associated with lesions of light-sensitive retinal cells.
• be free from visual distortions and any refractive power so as not to affect the sharpness of vision, causing discomfort. Very thin lenses as well as economical polarizing lenses suffer from the appearance of distortions.
• be free from prismatic power, as its existence could cause misjudgment of distances, diplopia or dizziness. Usually problems arise in curved glasses. Usually problems arise in curved glasses.
• have polarizing lenses when attenuation of dazzling reflection caused by horizontal surfaces is required. This is especially useful for drivers and people who are very involved in the sea. Here, however, it should be clarified that there are customers who are not served by polarizing glasses (especially those who look at screens while working) but also that there is a very large variation in the qualities of polarizing filters.
• have a shade adapted to the habits and requirements of the user. Very dark lenses are unsuitable for general use and driving but are recommended for people on high altitude like alpinists and skiers. Drivers have better reactions when their lenses have a brown tint or have a brightness variation (degrade). Those with low vision need specialized shades that emphasize color contrasts.
• correct any refractive error. This is already known to those who wear glasses for myopia, hyperopia or astigmatism, but it should be emphasized that even in small numbers (example myopia-0.50, where visual acuity is 8 to 9 /10), combined with the darkness of the lenses, visual comfort is reduced if the refractive error is not corrected.
• be safe in terms of the possibility of an accident, both in terms of material and design. Especially the first concerns the possibility of breakage (with the crystal being clearly inferior while the polycarbonate ideal) while the second has to do with the presence of safety cuts, rounded finishes, etc.
• be resistant to time and wear. In addition to the fact that cheaper lenses wear out faster, your lifestyle plays a role in which material is most durable for you.
• To be made of very transparent materials. Here the crystal lens is the golden standard, but there are many variations in the quality of organic lenses.

We understand that the more of these criteria are met, the more protected we will be and also the more comfortable we will feel. Also, we observe that the fulfillment of the requirement for protection from UV radiation is simply insufficient. In fact, fluctuations in the qualities of lenses affect their price greatly.

Polarized lenses are ideal for drivers, but not suitable for all situations