Hey John,
Have you looked into the whole diopter scene? I now have diopters on ALL my old film cameras. About four years ago I was getting really frustrated with my M6, missing focus, never seeing it sharp enough, and finally went and tried some diopters, and BAM!!, I was back in business. The problem with this eyesight thing is it comes on slowly as you age. Barely perceptible until everything is just soft.
So I've got diopters on my Nikon F, Nikon F3HP, Nikon FM2n, Canon TX, Canon A-1, and all three of my Leica M bodies (including the digital M-E). And now I can focus them just like I did back in the 1970's & 1980's when my eyes were young.
Picked up a Rolleiflex off of eBay last month (haven't had one in many years), and was checking it out, and couldn't get it to focus sharply, even with the little magnifier popped up. Thought the camera was defective. Then by chance I happened to put a diopter lens over the pop up magnifier, and snap, everything was in sharp focus.
It's a bummer that our eyes change as we age, just glad there are corrective lenses so we can keep on shooting.
Best,
-Tim