Humans have visually oriented brains. Our vision evolved to help us survive predators and also helped us capture our dinner. As Shiela Reaves says, our vision evolved to help us defeat camouflage.
Reaves is a professor of Life Sciences at UW-Madison, and a member of the UW McPherson Eye Research Institute.
But today there is a different stress on our vision. We are bombarded by images. Some of us look at computer screens all day, absorbing the pictures Facebook, Instagram, Snapchat and other apps offer us. We watch many hours of television.