I rarely run into people with worse eye-sight than my own. Must be the prescription.
But I just do not have a problem using the finder on the Retina II, and my original statement that the eye relief was better than the Contax II and Nikon S was made by looking through them this evening. These cameras have squinty finders by mid 1950s standards. The Leica M3, Nikon S2, and Canon V series cameras raised the ante on useable finders, and Zeiss just did not keep up. The Retina IIC and IIIC finders are very good. For extended use - worth looking at.