How can the man in the back see? In the back of this screenshot from Naruto episode 80 (during the Third Hokage's funeral), circled, is a man with his face entirely covered by bandages. Is it known how he can see?
That ninja was shown, earlier, in the Chunin-exam.

 

Because he takes care that nobody cheats in the exam, he must have an ability to sense things without using his eyes. It's most likely a special jutsu or Kekkai Genkai.