Of all the sensory powers that humans share, the sense of sight has been most admired. In science, it has been studied much more than taste, or touch. In religion, spiritual sight is the preferred metaphor to use (have you ever heard of someone with spiritual touch, or taste?) Advertising needs to know how we see. Philosophers have been obsessed with the "problem" of how we see the external world. Art is largely visual, and the beautiful is mostly linked with the visual.
What is so special about sight? As I just finished writing a paper on a philosopher's theory of visual perception, I must admit that I too have been caught with the fascination of sight. If you haven't, read this book!
A Natural History of Seeing