Photochromic and polarized properties are combined with lightweight NXTreg, shatter resistant lenses with anti glare coatings, resulting in superior visual acuity and performance. The exclusive Polar PhD153 lens technology is available in Serengetireg Driversreg and CPG153 Cool Photo Gray lens hues. Polar PhD153 Driversreg Lens Serengeti's Polar PhD153 lens is built upon the NXTreg platform and is exceedingly lightweight, retaining all the technology you'd expect from Serengeti and more. Polar PhD153 lenses deliver the latest in polarization, photochromic technologies, exclusive hues and high definition benefits that are near glass in quality. What's more, Serengeti's Advanced Polarized Surface Technology153 has been engineered into the backside of the lens to avoid the delamination and deterioration inherent with film. The amber colored Drivers lens is ideal for driving because it enhances colors and contrastwhile lightening and darkening to provide o