Many surveys have been taken asking people what their most valued sense is. While there are arguments to be made for all of them—and few among us want to lose any of them—the sense of sight is consistently listed as supreme. Through our eyes, we can enjoy the rosy glow of the sun setting over a snow-capped mountain range. We navigate through the hustle and bustle of a street market at high noon. Our eyes recognize the danger of a busy city street corner, and the calm tenderness of a smile on our child’s face.