No matter the conditions, the limited edition Zeal Optics Link Spherical goggles I tried out this past weekend will have you covered. New for 2008, they feature the world's first polarized and photochromatic lens. Polarization allows for increased clarity and depth perception, but the lens also changes the level of opacity depending on the light and time of day, adapting to low light and sunny conditions. By eliminating the need to switch out lenses, this is truly the only goggle you'll need.
The spherical lens is form-fitting, increasing peripheral vision. Vents increase air volume and eliminates fog. Throughout a day on the mountain I never experienced any lapse in vision due to flat light or fog. The shape is compatible with most helmets while strategically placed rubber strips on inside of the headband help keep the goggle in place.
The most comfortable and functional goggles I've worn, purchase them for $200 at Zeal Optics.