Mine are what ever Lens Crafters offers. Being blue eyed I know about the need for the UV protection..it is unfortnate I can't wear sunglasses...they create the same condition as night time resulting in very low vision. I've tried all different colors, the yellow/amber creates the least problems, but still knocks my vision down quite a bit.
Have you considered polarized prescription sunglasses? They cost a little more but it can make a big difference for many people. Also, the chain stores often use polycarbonate lenses as their first line product. These are nice in respect to being lightweight and shatter resistant but often add some distortion, chromatic abberation, and are scratch prone. Hope this helps.