Even shihans dont have eyes in the backs of their heads.
Actually, you might be surprised, Krystal. Training in awareness and perception can and does result in states that allow for a much greater range of senses - with a feeling/attention that is even greater than the physical eyes can "see."
"Seeing" from our eyes is just a habit we get programmed to use. With proper sensitivity training, people can "see" with many different facilities other than just the physical eyes.