Il material from which the lenses are made is an important element to consider when looking for a new pair of sunglasses.
The material not only determines the strength of the lenses, but also their visual properties.
We know the lenses better.
Le glass lenses they have one unmatched quality and for this reason they are the most expensive. In contrast, the glass is heavier though and could chip in case of impact. Therefore, even if glass lenses are the best choice from a qualitative point of view, they are not suitable for all activities.
The lenses in CR39 (plastic) are thinner, cheaper and lighter compared to glass (they weigh about half). Nowadays it is the most used material for making sunglasses. The CR39 offers excellent optical performance even in the case of highly graduated lenses. In addition, it has good scratch resistance.
Polycarbonate lenses are the lightest on the market. Although they don't have the same excellent visual properties as glass, they are ten times more impact resistant than plastic or glass and provide total UV protection.
We advise you to avoid the acrylic lenses, unless you plan to buy new glasses often. The lenses produced with this material are the least durable and least performing optically.
The best material for sunglass lenses is CR-39.
While CR-39 lenses can still splinter under heavy pressure, they are still much more impact resistant than glass lenses.
The plastic lenses remain today again the most popular and widely used by many people around the world. The reason for its success is certainly linked to the fact that this material remains one of the cheapest among those used for the construction of glasses.
Source: www.lentiamo.it
