I have not seen any sunglasses that are truly non-reflective. As has been said already, the best thing to do is always try to be in the shade. If that's not totally possible you can pull the brim of your cap down low to provide shade.
I'll just mention something that an eye doctor told me years ago about sun glasses. He said never to wear those that just darken your vision. They can cause your pupils to open wider than normal, because they are dark, and allow more harmful rays to enter your eyes than if you were not wearing sunglasses. I'd never thought of that.
Thanks,
Clark