The Zeiss 8x30B, manufactured by Zeiss Oberkochen (West Germany) in the fifties and sixties are superb binoculars, very sharp and bright and still capable of holding their own in todays high end competition. As Zeiss made a monocular version too, to be used as a lens for their Contaflex camera, I can imagine you are considering these. They are offered on eBay quite regularly in excellent condition, and quite cheap too.
BUT! A monocular, even the optically best, has one big disadvantage: you never can hold it as steady as a binocular. If I lost sight in one eye myself I’m sure I would never use one. Instead I would block one barrel (no light there) and use only one half of the binocular.
I think you could turn the disadvantage of the lost eyesight in one eye into an advantage here by using a binocular with individual focussing (see the others post too). Those military spec binoculars are usually very, very sharp, right to the very edges, and they are often optically corrected for a superb flat field. The Fujinons are good suggestions but if you want a cheaper solution I would suggest the Russian BPO 7×30. I use one of these myself quite often, in fact it’s one of my favorites (among Leica Ultravid, Zeiss 7×42 B/GAT*P* to choose from). These BPO’s are infamous for their yellow colour cast but if you can live with that (I certainly can, even more so, I even like it, as I feel it’s often more natural than the exaggerated brightness in much of the optics of today!) you might present yourself with a birding binocular with very special qualities: unsurpassed edge to edge sharpness, unusual large field of view (150/1000 m), superb contrast and resolution.
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