I'll also recommend the Nikon alternative. I have three F3HPs (kept at different locations) and find this to be a great piece of gear. Everytime I wind the film advance lever a smile comes to my face - it is so "buttery smooth".
The F3HP can be used in fully manual mode if you prefer - but does also provide for aperture-priority mode for when you don't want to "think" too hard!
I also have a F5 and although it is auto - the built-in diopter is an attractive feature that may suit your needs.
I wear glasses and find it difficult to use. Are there any similar alternatives in the Canon FD, Pentax, or Nikon worlds that might fit my needs?
I think with wearing glasses, it gets harder to see any viewfinder. I have a rubber attachment on the viewfinder of my Nikon FM body to protect my glasses from getting scratched. And that's even worse. I can't see anything.
But since this camera shows only 80-some percent of the actual frame in the viewfinder, I don't worry too much. Instead, I've learned not to rely on the viewfinder but go with my instinct and intuition for snap shots without framing as precisely.
So, I preset everything in my hands. I check the light meter once or twice if the light doesn't change drastically. The focusing (distance-reading) isn't so critical since I've gotten so used to using the same 50mm prime lens on this camera.
And any prime lens shorter than 50mm, I'm usually okay at this point. It's fun and brings me some surprises sometimes.
Some of the older EOS bodies work quite well as manual cameras and don't have complicated interfaces.
I have an EOS 650 -- the first EOS camera -- and mostly use it with old screwmount (M42) lenses with an adapter. It's fine for that. The interface is simple and, to my mind, fairly ergonomic. Usually I just set the aperture on the lens and let the camera choose the shutter speed.
The autofocus on it, however, is not good. It's accurate enough if you are careful with it but it takes a very long time to focus and sometimes hunts back and forth. I rarely if ever use it -- I have one EF mount lens and when I use it, I usually focus manually anyway.
Another nice system camera, with nice lenses, is the Pentax LX. This is still relatively compact, and very well made. I still know two professionals who use these for their work, one of whom is in his fifties and wears glasses.
i sold my electronic mz-s and bought a LX some months ago. very nice camera indeed and good quality. Suburb light meter!