Describe the significance of Eliezer looking at himself in the mirror. What did he see? What does this mean?

Three days after Buchenwald was liberated, Eliezer became deathly ill with food poisoning and spent two weeks in the hospital. After he got a little bit better, he gathered enough strength to look at himself in the mirror. He had not seen his reflection since living in the ghetto. When he looks at himself, he sees the eyes of a corpse, and that image has never left him.

"I wanted to see myself in the mirror hanging on the opposite wall. I had not seen myself since the ghetto. From the depths of the mirror, a corpse gazed back at me. The look in his eyes, as they stared into mine, has never left me." The Nazis transformed Eliezer into a living corpse, a shadow of his former self, and surrounded him with constant death and misery. They killed his family, reduced him to base, animal instincts, and denied him his humanity. No matter what revenge Eliezer and the other prisoners may seek from the Nazis, there is no way that they can undo what has already been done.