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I don't use prescription glasses, as my eyes are still quite good and even at a distance - although I've been losing close focus for ages so that for general use I depend on a pair of cheap (local Job Lots) 2.5's. Went with 3.5's for awhile for ground glass viewing, but the 4's are just a bit better.
There are times though (very few, but they do happen)...like when using my 150 G-Claron or 120 S.A. in faint and/or low contrast light, or with a particularly smooth subject, that I'd like something a little more, and for this I will, very occasionally, pull out my Nikon 7X loupe to double check after first using my glasses. But even then, I'm usually spot-on.
I use an inexpensive Peak 10x loupe which is fantastic to focus on the ground glass.
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