Snap's Spectacles 2 were functionally better, but not a revolution -- and they were still a bit dowdy. Its latest attempt at smart eyewear might fare better, though. The social service has unveiled Spectacles 3 glasses that include dual HD cameras to capture scenes in 3D and introduce augmented reality Snapchat effects to moments where they weren't previously an option. You can add 3D filters to your walk, take pseudo-3D still shots of your friends and add 3D Lens effects to a bike ride. While you can only record video for up to a minute of continuous video at a time, that's still a tangible improvement over the 10 seconds from before.