The smart glasses industry has long been a tortured dream of Silicon Valley. The premise is appealing enough: What if, to enjoy the benefits of mobile computing, people didn’t have to stare at their phones all day long and could, instead, simply wear a lightweight computing device on their face? Science fiction fans (a demographic that is strong in the tech industry) can see this vision perfectly. However, the industry has — for much of the last decade — resembled a financial black hole into