Any vision decline is of concern, and you should visit an optometrist before assuming your blurry vision is due to a vitamin deficiency
Hmmm...this is ferociously complicated...and no idea if B12 injection is related to your high serum iron and iron saturation (perhaps someone more knowledgable will leave information about this)
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I could start a long explanation about the role of B12, B6, folic acid and zinc in relation to iron uptake (or not!) but it's so complicated that I'd likely confuse myself (and you, in the process)