Seems like one of the obvious applications. I wonder why it isn't mentioned. Is there a technical limitation that make it impractical? Size maybe, the lens shown in the article are all tiny and I guess lens that would be practical for AR/VR would be really expensive.
> Is there a technical limitation that make it impractical?
Yes. Diffractive optics (which includes meta-lenses) have significant wavelength dependence. Visible light is 400-700nm, which are different by about a factor of 2. This means blue light will focus almost twice as far away as red light does.
The neat bit is this is actually the reverse of how refractive optics behave, which means you can use both together and cancel out a significant portion of chromatic aberration. If we can scale up the manufacturing (and ideally apply them to curved surfaces) they could improve performance and reduce complexity and weight of VR/AR optics.
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