Contact lenses could soon replace our phone screens

Walk down any street and it's a familiar scene: people craning their necks as they look at their phones. But in the not-too-distant future we'll probably just stare at digital information hovering over the world in front of us, taking in a blend of the digital and real worlds, all thanks to augmented reality.

In an ordinary office block in Saratoga, California, dozens of engineers are working to realise that future, churning out prototypes on a weekly basis of a smart contact lens stuffed with tiny circuits, batteries and one of the world's smallest displays.

When I visited Mojo Vision's office in July, I held its augmented reality smart contact lens about an inch in front of my eye to try out its features, shifting a cursor around the space in front of me by moving the lens. Since I couldn't wear the contact lens, I used a virtual reality headset to test its eye-tracking technology and demo apps, directing a small cursor by simply moving my eye. I could read from a digital teleprompter that displayed a series of words as I moved my eye, and I could also look around the room to see arrows pointing north and west, designed to help eventual users with navigation outdoors. 

Technologists have talked for years about what the next computing platform will be, a decade after mobile devices replaced desktop computing as our primary gateway to the internet. Meta CEO Mark Zuckerberg is placing his bets on the metaverse, a fully immersive virtual world entered via a headset.

But I think the bigger shift will be to augmented reality, where glasses or contact lenses display information on the world around us so we can see both the online and real world at once. If there is one thing that humans love doing (albeit badly in many cases) it's multitasking. Phones will become more like mini servers that coordinate all the different devices we'll increasingly wear on our bodies: earbuds, watches and soon eyewear, the latest piece in the puzzle of invisible computing.

Mojo Vision's lenses are a marvel in engineering and perhaps one of the most ambitious hardware projects in Silicon Valley today. The company had to develop its own chemicals and plastic compounds that would allow an eyeball to breathe through a lens covered with electronics. When I held the lens in my hand, it was noticeably thick, and large enough to extend beyond the iris to cover parts of the whites of the eyes.

The big question is how to balance being present in real life while constantly seeing digital information. Today, it takes a few seconds to take out a phone, launch an app and carry out a task on its screen. In the future, we'll be able to enter an app simply by looking at it for an extra second. That will throw up all kinds of thorny issues around addiction and how we interact with the world around us.

Whether with contact lenses or glasses, the human eye will point to a world swimming in more digital information than ever before. Our brains will have a lot to get used to.