Thanks for all the input, *checking out some links* ...I'll be shopping around.
For extra information, I don't generally shoot with my glasses, (I tend to just nudge them out of the way, and use either an eyecup or in the case of the K20D, the magnifying eyepiece.) My prescription is actually quite mild, and I can still test at 20/20 or a little better without them: the problem is that eye fatigue can set in very quickly without the astigmatism correction, and then it gets much worse.
Actually, I have a pretty neat related idea. An eyeglass holder that goes on the camera or strap somewhere. Maybe something I could put on a hot shoe foot, like those little clips they sell for car dashboards. Hrmm.
I wonder if the super-coating Saaby mentions (claiming to be scratch resistant as well as easy to clean) does as promised. I'm kind of a maniac about clean glass, and scratches do seem to be a worry. (And, actually, I do think some lenses and filters are coming out with similar coatings, these days, Saaby. I was shopping for some filters for my new Pentax glass, and I guess Heliopan has come out with something like that: I guess their previous coatings were a tad soft and hard-to clean. I'll believe that: there's an older one on my bridge camera, and it's fussy in that way. )
How fancy I get may have to do with if I find frames I like, (thus how long I may want to stick with em. I had a pair of old ones with Transitions glass in there, (Pity they're the wrong prescription) and those were OK. A little brown tint is actually a pretty good look for me. (And I think I'll be going back to brown, ...when I started doing more photo again, I got some grey non-prescription ones like I used to, with the idea of not messing with my sense of color and contrast, but I'm finding it would probably be more valuable to see the world in the yellowey brown, more inspiring that way.
Anyway, somewhat forearmed, now.
Thanks, all.