Google Glass may be able to take pictures merely by winking11
A curious code jockey did some digging and shared some insight on Reddit about an interesting (or creepy) function that Glass might be capable of doing, “wink” gestures.
Okay, so wink gestures could actually have a purpose, like using winks to advance through an email or browser page. It can also serve to take a photo as noted by “EYE_GESTURES_WINK_TAKE_PHOTO.” Well look at that! The guy who found it thought that idea was kind of creepy.
The code also indicates that other tasks may be programmed to operate upon a wink command as well. To that end, we will be very impressed if Glass can tell the differences in winking along with regular eye activity. Just remember to smile for the camera
and hopefully you will not get something in your eye in the process.
source: Ars Technica