The old man's blue eye can be said to be able to see the evils in the narrator's mind. The eye scares the narrator because he thought no one could see the impurity in his character, and the fact that the old man treats him well mocks him in a way. Then he gets the idea of ​​killing the old man to prevent the healed eye from offending him. Poe precedes Dostoevsky and modern writers in exploring motiveless evil. The narrator quickly informs us that he killed the old man for none of the usual reasons but only because he couldn't stand the gaze of the man's blind eye. (enotes) The narrator is, in this case, an unreliable narrator because he is not sane but begs others to think he is. Killing some because you didn't like the way their eyes looked is not a sensible thing to do. The narrator doesn't even take a step back to realize the act as murder or what the consequences would be if they were discovered. Throughout the story he is trying to prove, sanity exists within him as he lays down the old man's body in a "healthy" manner. The narrator struggles with his sanity and asks why if they still thought he was