Typical aviator sunglasses will help a lot... for example Ray Bans. I happen to have Serengeti "Drivers" sunglasses for all ocassions, because I like the style. In any case, the aviator type sunglasses add much more contrast to your view, which helps depth perception. Such sunglasses can typically be worn in very low lighting conditions as well- I've actually worn them in a car at night to see the effect, and it's pretty amazing- I swear I can see a little better at night with them on.