I must echo what Paul just posted. In terms of seeing the entire frame, the best viewfinders for glasses wearers are the .72x Leica M viewfinder, the Bessa R, R2 and R2a series (NOT the R3a), and the .58 Leica M viewfinders. And the Hexar RF.
But different glasses wearers need a different eyepoint. It has to do with the shape of your face, how deep-set your eyes are, and your perscription. My own use of a 35mm lens improved drastically when I got contact lenses, even on a .72 M. I could now see the whole frame, rather than just most of it. So I tend to wear contacts if I'm doing fast shooting involving a 35mm lens.
The Zorki 4 viewfinder is useless to me with glasses. All I can see is the RF spot plus a little bit. With contacts, it's OK, but I prefer a Voigtlander brightline 50 finder. One nice thing about the Zorki is that it has a diopter adjustment lever concentric with the rewind knob. People who can see adequately without glasses but need a little help for critical focusing can adjust the diopter lever and all's well.
Perhaps one of the external finders would help you see the whole frame, but they can be a pain to use. For me, the Voigtlander 50mm finder is wonderful without glasses, and usable but a bit restricted in the corners with glasses.
--Peter