Ralph Lauren Purple Label has a nice series of Keyhole sunglasses under $400. Do they carry prescription frames this style? I don't know.
You may want to try this look and see if it suits you. I believe it will. Perhaps snap a few test shots from the store and post.
As for prescription frames, I have to concede to others to assist.
i should've said in my earlier post, i'm looking for something perfect since i wear glasses 99% of the time. i'm interested in something understated and classy that exudes a smooth confidence. to help with context i work in an operating room.
I think it looks fine, especially if you work in an OR where you don't want anything too fashion-forward. If your prescription isn't too strong and you want another pair that's more trendy, but inexpensive maybe try one of the online stores in this article: http://www.nytimes.com/2012/01/19/fashion/eyeglasses-on-spec-online-retailers.html?pagewanted=all
I was interested in several of them but none could handle my astigmatism.
Fred