I'm nearsighted, have significant astigmatism in both eyes, and I'm left-eye dominant.
I can see all of the image in the viewfinder with my old manual-focus 35mm SLRs (pressing the glasses lens against the camera's eyepiece). This isn't possible with a lot of SLR viewfinders. Compact, fixed-lens RFs have also worked well for me.
Being left-eye dominant, if an SLR has controls to the immediate right of the finder, I simply can't use it.
Even so, I found myself moving more to TLRs and waist-level finders, where the glasses weren't a problem at all.
Adding a DSLR to the mix now, I'm finding that there is so much in viewfinder that I can't see it all with glasses on. So, I have to take the glasses off, adjust the variable diopter in the finder for my myopia, and try to see around the astigmatism. It still remains to be seen if I will be able to make this work.
- Murray