Thanks, everyone, for these detailed comments. This was exactly the kind of information I was looking for.

I think I have a fairly strong prescription. I've been nearsighted enough to wear glasses since about age 9, and last year got to the bifocals stage, for which I'm wearing progressive lenses. I also have astigmatism in one eye. And I'm an avid reader, so it's really important for me to have as clear near vision as possible. So it would really bother me if the glasses were " a little out of focus."

Then again, some of you, even with complex vision situations, sound like you've had a good experience. I may go to the local LensCrafters to look at frames (not a strong point of my current place) and get a sense of the place. And perhaps try them first for prescription sunglasses which I don't wear as often. (With the various discounts and coupons hopefully these won't cost too much.)

I think I'll also try to look into other sources. (including Pearl vision.) My insurance company lists several individual practitioners as well, but I never heard of any of them. I may try to investigate that further though. Although it might unfortunately by the case that any place accepted by the insurance company is going to be of lower quality…

Thanks again for all the advice!
Zhenya