Someone had once said that what you are can be seen in your eyes, for they are the windows to your soul. But no matter what people had said about the eyes, it still remains the most important sense of all, because not only does it allow you to connect visually to the outside world, it also brings you a kind of pleasure that no other sense could give you, the pleasure of sight.
But, did you know, human corneas are very similar to that of a shark's and it should come as no surprise then that the have actually been used as replacement in eye surgery for human.