Tips on Selecting Frames for Mountaineering :
Frames: Metal frames become brittle in the cold and may snap so we recommend a plastic or nylon frame since these hold up much better in the cold. A wrap style or a frame with side shields will protect your eyes from wind and snow, which is especially important for contact lens wearers. They also help block out incidental light from the sides, helping to minimize glare.Lenses: At high altitudes, it is especially critical that your eyewear protect you from UV radiation, which is present in both sunny and overcast conditions. Glare increases on surfaces such as snow and regular sun lenses do not provide adequate absorption of glare. Polarized lenses absorb 98% of the glare so you don't need to squint. Please Note: Polarized lenses absorb so much glare that you may not be able to distinguish patches of ice from regular snow. You also may want to consider a photochromatic lens, which will lighten or darken according to the amount of light, getting darker in bright sunlight, and lighter in an overcast sky. Polycarbonate lenses are highly recommended for their impact resistance and durability. When climbing in bright sunlight, you should wear a sun lens. If snow is present, a brown or amber lens will provide the best contrast against a white background and works well for lower light conditions (i.e. when the sun goes behind the clouds). Several manufacturers have specific lens colors for mountaineering. Manufacturer's Innovation: Bollé's Altitude Collection features high contrast Polycarbonate Polarized Sandstone™lens with anti-reflective (AR) coating is perfect for extreme light management. This high contrast lens has a warm rose tint that makes things darker and enhances colors without changing them. The polarized lens removes reflected glare, and the AR coating removes backside glare without compromising the transmission of light. The lens is also available with a gold flash coating that reflects additional glare, making it the ultimate all-purpose lens for mountain environments. Other features include side vents and Thermo-Grip™ anti-slip nose and temple pads. Some models also offer Air-Flow Temples, a unique venting system incorporated into the temple design that provides additional anti-fog capability. Bollé technology can take you to the edge and more importantly, get you back again. So now if your vision distorts at 13,000 feet, it's because you're not getting enough oxygen to your brain.
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