Serengeti sunglasses have been around for many years, but they are new for me so I'm enthusiastic about them!! The frame quality is excellent and the lenses are second to none. All the lenses are photochromic and have the option of polarization. There are many color options making them such a versatile product for the patient. We can't forget the beautiful display case with an video screen and the super user friendly website for Rx ordering. If you couldn't tell, I'm very impressed!