I was writing code for Google Glass that implemented facial recognition. A friend of mine suffered a TBI in an automobile wreck and developed partial facial prosopagnosia as a result. I was basically writing software that would recognize faces within 15 feet of the wearer and compare it to images of their contacts in their Google account, and would throw up an AR subtitle identifying the person on a match. Not too long after I filed the developer applications and outlined my project, the Glass project flatlined.