The Question and Answer section for Poe’s Short Stories is a great resource to ask questions, find answers, and discuss the novel.
The narrator says that the old man's bulging eye bothers him so much that he has to kill him.
The external conflict is the narrator's disgust at the sight of the Old Man's deformed eye. Note, there are two external conflicts.... the other would be the narrator's conflict with the police.
Please place your questions in the proper category.
Exposition: The introduction of the narrator and his declaration of sanity.
Rising Action:The narrator's observation of the old man with the "eye" and his plotting of the man's murder.
Cllimax: The narrator's murder of the old man by suffocation....