Epson debuted the third iteration of its Moverio AR glasses series, dubbed the BT-300, at the Mobile World Conference in Barcelona on Monday. The new smart specs boast completely transparent lenses impregnated with OLED displays, a quad-core Intel Atom X5 processor and the Android 5.1 operating system. Plus, they weigh 20 percent less than their BT-200 predecessors, making them the world's lightest AR glasses. They're currently available for preorder and are expected to ship later this year.