Remember those "eye gestures" spotted in Google Glass code? Developer Mike DiGiovanni, who just released the "Bulletproof" lockscreen for Glass, has already used them to develop an app called "Winky" that snaps photos on the Explorer Edition of the AR eyewear. When activated and calibrated, a simple wink of the eye allows you to capture a still of whatever you're looking at, rather than using a voice command or tapping the side of the glasses as normally required, which DiGiovanni says "takes you out of the moment." He released the app purely as Android source code to protect users' personal info, so if you're interested, you'll need to compile and run it as an APK -- assuming you're lucky enough to have a pair of the specs, of course.
Source:Mike DiGiovanni (Google+)