Deloitte:The Outlook for Wearables: The Eyes Have It In the race for wearable computing devices, smart glasses will likely emerge as the winner—with the number of users exceeding 100 million by 2020.

                                                             "Next contestant please"

"Industries most likely to benefit from smart glasses in the next three to five years include manufacturing and oil and gas, which have high-value engineers whose productivity could be enhanced through access to line-of-sight information. Analysts have estimated that smart glasses could save companies up to $1 billion per year by 2017—through displaying instruction guides, relaying photos and videos, and allowing employees to interact with experts in offsite or remote locations."

http://deloitte.wsj.com/cio/2014/02/18/the-outlook-for-wearables-the-eyes-have-it/