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Simple anisometropia is a condition in which only one eye has hypermetropia or myopia i.e. Far or short sighted Ness in one eye. You can also have one be farsighted and the other short it's called antimetropia. That said it's probably for old man anesthetic purposes. I personally like to think nothing's wrong with their eyes they're just hipsters.
Yo this is kinda a side note but if the MC got that little round glass (i forgot the name) that butlers usually wear instead of glasses wouldn’t she be able to both aura and facial expressions?