I have a pair made by Randi at Sports Optical. I was one of those folks turned down by everyone else (don't give up hope michelem), mainly because my face is too narrow and my interpupillary distance is too small, rather than my prescription being too strong, but the effect is the same - too thick at the edges when they are curved lenses.

I love having prescription cycling glasses. I've never worn contacts and the rx glasses I could get were not that great. Sports Optical made me inserts to put into Smith frames. I went with transitions because the lenses are quite pricey and I could only afford one set at the time, but I hope to supplement them with some yellow or orange (for cloudy/rainy days) and some very dark ones some day.

Everyone else said no - even Oakley, which claims they'll do rx for just about anyone, so Randi is my hero.