Companies have been attempting smart contact lenses for years, but two companies are close to success. Here's what needs to happen to get them in our hands

As nanotechnology has advanced, smart contact lenses are becoming more of a reality. Companies like Mojo Vision and Innovega have working prototypes and are close to bringing this technology to market. But we're still years away from getting them into our eyes. We explore the challenges this industry has overcome and is still facing.