he eyes of some mammals have evolved to point in the same direction. While animals with forward facing eyes lose the ability to see what's behind them, they gain X-ray vision, which makes it possible for them to see through the clutter in the world. Credit: Rensselaer/Changizi The advantage of using two eyes to see the world around us has long been associated solely with our capacity to see in 3-D. Now, a new study from a scientist at Rensselaer Polytechnic Institute has uncovered a truly eye-opening advantage to binocular vision: our ability to see through things.