The firm built the device in partnership with sunglass designers EssilorLuxottica and they will start at $299 (£219) in select retail stores.

Facebook said the glasses have two integrated 5MP cameras that “let you capture life’s moments as they happen” from a first-person perspective.

Photos and videos up to 30-seconds long can be taken using the capture button or hands-free with Facebook Assistant voice commands.

In order to allay privacy concerns, the device includes a hard-wired capture LED that lights up to let people nearby know when media is being captured.

Open-ear speakers are also built in to the sunglasses, and a three-microphone audio array allows users to take calls on the device.

Facebook said it had included “beamforming technology” and a background noise suppression algorithm to provide the same calling experience you’d expect from dedicated headphones.

Ray-Ban Stories have been designed to pair with the new Facebook View app on iOS and...