I more or less agree on the "pinch on nose bridge" type of mini-reading glasses that can fit in a wallet. Thanks (and I do mean thanks) to the link given earlier, I also ordered something like three sets of these, and after some experimentation I think I'll be fine with these replacing my formerly "lighter than usual" reading glasses. The ones I had been carrying were in a small metal tube (smaller than normal drug store reading glasses), and are basically normal reading glasses but with less vertical glass. I would have to hold my head at just the right angle and get in the habit of keeping it there in order to read.
In that context, the pinch-on-nose-bridge type aren't necessarily a step down so much as a step sideways. More ~glass (lense anyway) to see through, but at the cost of a less comfortable way of wearing them. Since they are lighter and pack small, I think I can get used to them.
Note that I don't tend to want to use these when on the trail; it's possible that will change as my vision continues to degrade (one foot on a banana peel and the other one ...). But for now, at least, sweat isn't an issue for me, but a good thing to keep in mind.