The old man's eye.- it indicates a lack of visual clarity
and reliability of the man.A watch
is a visual and auditory representation of time.The narrator, who literally controls the time of
death for the old man, compares himself to a watch's minute hand.It is a symbol of narrator's paranoia and
insanity: "I think it was his eye! Yes, it was this! ... Whenever it fell
upon me, my blood ran cold".It symbolizes the narrator's guilt.That's why he did't trust people and was
afraid of surrounding world.???