Rearview Sects: Spy Glasses Mirror Vision Sunglasses - See What's Behind You! The special secret coating gives you "rear vision". You can spy on stuff behind you! These specially made sunglasses have a mirror on each side allowing you to see whats going on behind you. ery cool sunglasses for any age. Kids love using them along with teachers to keep an eye on students. You can also use them as cool looking sunglasses. Fun for kids and adults!