Ineffective in cars – Photochromic lenses darken in reaction to UV rays, which your windshield blocks. Because of this, transitional lenses won’t darken very well in the car. Differences in brands – Another issue that can arise with photochromic lenses is that different brands have different levels of darkness and different reaction times. Here are 5 ways to tell if your sunglasses are UV protected. UV Protection is the ability of a sunglass lens to block UV rays. Most lenses are made of glass or plastic, and certain materials are more effective than others at blocking UV rays. There are two types of UV protection: 100% UV protection blocks all versions of ultraviolet light Windshields are made of laminated glass, featuring a thin 0.8-mm piece of stretchy plastic sandwiched by two layers of 2.1-mm glass. Because plastic is naturally good at absorbing UV rays A good pair blocks more than 99 per cent of UV radiation from reaching your eyes. Tints and mirror coatings relieve you from squinting, by absorbing or reflecting intense, dazzling light in the visible part of the spectrum (the light we can actually see). The highest-grade sunglasses also incorporate a polarising film to combat glare from
UV Protection. Polycarbonate lenses are ready to shield your eyes from UVA and UVB rays straight out of the gate: They have built-in UV protection, no additional treatments needed. Disadvantages of Polycarbonate Lenses . Cost. Polycarbonate lenses tend to cost a little more than regular plastic lenses.
Like the exterior, the interior of a car can degrade with extended sun exposure. In addition to damage from UV rays, cars’ interiors can build up intense heat when left in the sun, which can also cause interior damage. Common issues include plastic cracking and fading upholstery. Compared to cloth, leather upholstery requires more maintenance. PeaM.
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    • does plastic block uv rays