The latest update for the Google Glass allows users to take a photo with the wink of an eye.
The update to Google Glass, called version XE12, also adds a screen lock feature, and the ability to upload and share videos on YouTube.
Google said the feature was faster than the camera button or the voice action; works even when the display is off and may have numerous other uses in the future.
Google said: "Imagine a day where you're riding in the back of a cab and you just wink at the meter to pay.
"You wink at a pair of shoes in a shop window and your size is shipped to your door. You wink at a cookbook recipe and the instructions appear right in front of you - hands-free, no mess, no fuss."
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