I got contacts for riding and they make a huge difference. I have astygmatism (sp?), and the contacts correct for that, so now I'm seeing better than ever. They are a pain at first, it took me about a week to be able to get them in smoothly, but for me they're worth it. The disposible ones are good because you don't feel too bad if you lose a pair.
And I don't have to buy perscription sunglasses. I just have to buy contacts. I should actually do that this week. Thanks for reminding me.