Hacker News Reader

It occurs when you have glasses with 3D objects produced by either stereoscopic, multi-planar or other means overlaid onto the real world.

Glasses that show objects in 3D overlaid onto the real world sounds like XR to me.

But if you consider this to be AR, how is it different to XR and how can it be solved for AR but not for XR?

XR includes AR and VR