spherical lenses and a wide field of vision . the zeal optics hangfire combines the optical technology of spherical lenses with zeal’s award-winning observation deck technology (odt). its pantoscopic design provides a 20 % greater slope view—completely distortion-free. the hangfire revolutionizes modern ski goggles with its sleek design, wide peripheral field of view, and helmet compatibility.phoenix mirror lensthe phoenix mirror lens is specifically designed for variable conditions. it delivers clear, high-contrast vision and effectively reduces glare.vlt 36 %