un protection, which includes the use of sunglasses, is one of the Ten Essentials. No wonder. Sunglasses protect your eyes from harmful ultraviolet (UV) rays, reduce eye strain in bright conditions and protect you from flying debris and other hazards. Understanding Lenses Lens Material
The material used in your sunglass lenses will affect their clarity, weight, durability and cost.
Glass—PROS: Superior optical ray ban aviator sunglasses clarity; superior scratch-resistance. CONS: Heavier than others; expensive; glass will "spider" when impacted (but not chip or shatter). NXT polyurethane—PROS: Superior impact-resistance; excellent optical clarity; flexible and lightweight. CONS: Expensive. Polycarbonate—PROS: Excellent impact-resistance; very good optical clarity; affordable; lightweight and low bulk. CONS: Less scratch-resistance; slightly less optical-clarity than glass or NXT. Acrylic—PROS: Inexpensive alternative to polycarbonate, best suited for casual or occasional-use sunglasses. CONS: Less durable and optically clear than polycarbonate or ray ban sunglasses sale glass; some image distortion.
Lens Color (Tint)
All sunglass lenses are tinted to cut down on overall brightness and enhance terrain definition. But your choice of tint colors affect your vision by influencing 1) how much visible light reaches your eyes, 2) how well you see other colors, and 3) how well you see contrasts.
Brown/gray/green—Brown, gray and green lenses are color-neutral, which means they cut down on overall brightness without distorting colors. These darker shades are intended primarily to cut through the glare and reduce eyestrain in moderate-to-bright conditions. Yellow/gold/amber—Yellow, gold and amber lenses provide less overall brightness protection, but excel in moderate-to-low level light conditions. They provide excellent depth perception, which makes them perfect for skiing, snowboarding and other snow sports. They also enhance contrasts in tricky, flat-light conditions. Rose/vermilion—Rose- and vermilion-colored glasses really do make the world seem brighter. They provide excellent low-light visibility and enhance contrast (perfect for skiing ray ban men sunglasses and snowboarding in cloudy conditions). They also enhance the visibility of objects against blue and green backgrounds, which makes them ideal for driving or exploring in forested areas. Mirrored or flash coating—This refers to a reflective film applied to the outside surfaces of some sunglass lenses. They reduce glare Ray Ban sunglasses sale 2013 by reflecting much of the light that hits the lens surface. Mirrored coatings make objects appear darker than they are, so lighter tints are often used to compensate for this.