In the tell tale heart story in what way does the author repeated image of the "eye of the vulture' to create suspense

The use of the words “eye of vulture” creates suspension by creating a dilemma.  

Explanation:

In "Tell-Tale Heart" by Edgar Allan Poe the narrator, in the intent of proving he is not mad, justifies the murder of the old man because he says this one has an eye of vulture, which is waiting for the moment of his death. He says that the old man started to look at him with it. This situation creates a dilemma for the reader, who is considering if his decision was correct. However, in the end, the reader can see that the man is in fact mentally ill.  

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