So how do Smart Goggles work? It's pretty simple. You have a camera attached to the front, and a super-powerful tiny computer in back, which scans people and runs them through a face-recognition database. It then pulls up any notes you've made, including the person's name and other details. You'll appear to be the master of your social circle. They may also be able to feed you info from the Internet. They're being developed by Tokyo University, which just showed off a prototype.
Readers of Bruce Sterling's novels and stories will immediately recognize these as a primitive version of the interactive "spex" sported by his characters. Sterling has more to say about spex (among other topics) right here.