It ends with him stumbling in to a religious revival tent, utterly unable to comprehend the world around him. He tells the preacher that he can see the darkness around them, and the light beyond, and the eye at the center of the universe that sees them all. "If thine eye offends," the preacher says, "pluck it out!"
And so he does, the film ending with a shot of his empty sockets. There was, however, one alternate ending shot purely on the director's whim but never used. Only a few seconds longer, it had one final line: "I can still see!"