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It’s fine, provided it’s not a plot hole - i.e. your fantasy setting needs to not have abolished blindness as a realistic malady, which some settings do. E.g. LOTR 100% has blind people, while the Harry Potter universe only has very poor blind people, since solving blindness is as trivial as a polyjuice potion, even if nothing else works (and something more effective is bound to work).
I’ve never seen “dufus” spelled that way before, it’s immediately enticing.- like you hybridized the word with “Rufus”.