A week ago Facebook announced it was working with Ray-Ban on a multi-year deal to build and ship smartglasses. Mark Zuckerberg says they’re “the next step on the road to augmented reality glasses.”

So why does Irena Cronin say they fail?

She is the CEO of Infinite Retina, an xR consultancy, and a co-author of "The Infinite Retina: Spatial Computing, Augmented Reality, and how a collision of new technologies are bringing about the next tech revolution."

We chat about Facebook's smartglasses, Project Aria, North (which Google acquired), Snap and its Spectacles, and Apple's coming smartglasses product.