Night vision technology has been around for a while, but it's only really used by professionals (or professional creeps) due to its prohibitive size. But what if night vision was something you could fit into a pair of contact lenses? You could keep a pair in your bag to slip in if you were going to be walking home alone in the dark, or even use them to take a night-time jaunt through a forest without spooking all the animals. All this and more could be possible in the future thanks to a new development by researchers in the US using graphene lenses to sense “the full infrared spectrum” plus visible and ultraviolet light. "We can make the entire design super-thin," said Zhaohui Zhong, assistant professor of electrical and computer engineering at the University of Michigan. "It can be stacked on a contact lens or integrated with a cell phone." Current night vision technology needs bulky cooling equipment to stop the detectors getting confused by their own hea