A glance to the left. A flick to the right. As my eyes flitted around the room, I moved through a virtual interface only visible to me—scrolling through a calendar, commute times home, and even controlling music playback. It's all I theoretically need to do to use Mojo Lens, a smart contact lens coming from a company called Mojo Vision.

The California-based company, which has been quiet about what it's been working on for five years, has finally shared its plan for the world's "first true smart contact lens." But let's be clear: This is not a product you'll see on store shelves next autumn. It's in the research and development phase—a few years away from becoming a real product. In fact, the demos I tried did not even involve me plopping on a contact lens—they used virtual reality headsets and held up bulky prototypes to my eye, as though I was Sherlock Holmes with a magnifying glass.