I see people repeatedly refering to Serengeti Drivers Gradient lenses as transition lenses. They are NOT transition lenses. Transition lenses are also known as photochromatic lenses and AUTOMATICALY change color based upon the amount of UV available which is related to how bright it is.
The Serengeti Drivers Gradient lenses are in essence nothing more then lenses that are darker colored on the top and lighter colored on the bottom of the lens. The do NOT change automaticaly. So no problems there.
I also constantly see people refering to Oakley's as the only lenses that filter out UV-A, B and C. Also this is not true. Just have a look at the Serengeti manufacturers website. Serengeti's do in fact filter out UV C.
Then there are people that think that only Oakley's filter out UVA, B and C out for a full 100%. Again not true. You are comparing polycarbonate lenses of the Oakley's with glass lenses of the Serengeti's. If it bothers you that the Serengeti glass lenses "only" filter out 100% UV-A, 98.5% Uv B and C, and feel that the 1.5% UV B that is allowed to enter is big turn-off for you, you can get Serengeti's with Polarmax lenses. Same type of lens as the Oakley's with the same properties.
So if you want a true distortion free, color true lens go with glass and go with the awesome Serengeti Drivers or Drivers Gradient. Drawback, slightly heavier then polycarbonate and more prone to shattering.
If the lack of 1.5% UV-B filtration bothers you in a glass lens, go with polycarbonate Oakley's or Serengeti PolarMax. Drawback, not 100% distortion free.