Serengeti lenses offer the latest in photochromic technology, which constantly lightens and darkens throughout the day to ensure you see every detail.  The navigator-inspired Aerial is light on ounces, but not on style thanks to frames crafted with titanium, which are accented by distinctive bayonet-style temples.  The amber-colored Drivers lens is particularly well suited for driving.  Thats because it enhances colors and contrast, lightening and darkening for optimal light transmission in any driving conditions.  It is also engineered to transmit more red, yellow and green colors, making it ideal for identifying stoplights.  Thanks to its ability to relax your eye muscles, the Drivers lens helps reduce stress and fatigue while driving.