21st Century Learning and Teaching

Critics of Google Glass usually remark on how the device allows its owner to take photos and videos of other people without their knowledge or consent, which has contributed to some backlash, including bans on Glass in some establishments and an alleged assault on a Glass user.

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But a spyware app developed by two researchers has shown that Google Glass can be used to secretly take photos of whatever a Glass wearer is looking at without their knowledge - making the Glass user the one whose privacy and security is potentially compromised.

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The lens display usually lights up whenever Glass is in use, which is the only way to tell when Glass is on - other than witnessing voice and gesture commands used by the wearer such as "Okay Glass, take a photo."

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However, according to media reports, the app takes a photo every 10 seconds when the display is off, meaning the wearer (or anyone in view of the camera) is unaware that it's recording.