'Smart' glasses let you watch different scenes on same screen

What if you and your friend can watch two different scenes - one of a hero and one of a villain - at the same time while watching a 3D film?

Possible, with new 'smart' 3D glasses.

Named "Invisivision" and developed by the Ontario-based firm PipeDream Interactive, these glasses have an additional layer of lenses that can flip up and down - giving viewers two different experiences when watching a film.

"When viewing content with Invisivision, the user simply moves the additional lenses in front to reveal hidden content," the company wrote on Kickstarter.

"Moving the additional lenses back restores the original content," it added.

The glasses make use of the fact that 3D movies work when two image streams are displayed simultaneously, but they are slightly offset.

Using the two image streams separately, the illusion of two completely different scenes is created.

"Having one side of the glasses up and the other down will produce a standard 3D effect," the firm added.