I have type 11 diabetes and am also quite ancient-the diabetes effected the optic nerve in my left eye.I recently had cataracts removed and while this improved my eyesight considerably it also exposed the nerve problem to the extent that I saw two of everything, in perfect clarity with BOTH eyes open and only one of everything if I closed one eye.By putting a prism into my left hand lens the double vision was eliminated.Sorry mate I cannot comment on your single eye double vision problem.
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