Owlie, I hope someone has an answer, b/c I can't find any either.

Mine's -6.5 in each eye, with an extra -1.75 of astigmatism in one and an extra -5.5 of astigmatism in the other. I can't even get contacts with the worst astigmatism correction, so most of the time I just can't see out of my right eye.

But I've also found that even running with my normal glasses can get very uncomfortable with the difference between the field of what is in focus and what isn't (like if I look down or to the sides beyond the lenses). I don't know if I could handle that with prescription sunglasses while doing things that require me to see all of my surroundings

(My fingers are crossed that someday laser surgery catches up to astigmatism folks - I so want to be able to see like normal people.