Phineas Gage, American railroad construction foreman remembered for his improbable survival of an accident in which a large iron rod was driven completely through his head, destroying much of his brain’s left frontal lobe, and for that injury’s reported effects on his personality and behavior over the remaining twelve years of his life—effects sufficiently profound (for a time at least) that friends saw him as “no longer Gage.”
I have a character (who happens to be a cat, but that's not actually important. the universe of the story, a fanfiction, has human diseases and medicinal plants/techniques muddled with cat biology, so anything that works with people works minus surgery/metal instruments) who is blind in one eye But for the purposes of the story, her blindness needs to... shift? back and forth between eyes. Is there a disease or injury that could do this? I thought maybe ocular nerve damage, but idk. Thanks!