But eye tracking is a huge problem in itself, and, to my knowledge, it's not solved at all. I type this as I sit in front of my "15 notebook, and I need barely move my eyes to see the whole screen.

I think that figuring out where exactly I look on my screen is impossible problem to solve, since I always clearly see at least 3/4 of the whole screen. You can only guess where exactly on this 3/4 property of my screen I'm really focused.

I have tested several eye tracking solutions on VR platforms, including Tobii and FOVE. Both solutions worked well enough for me to play games at the same speed I would with other control methods. Although it may be that eye tracking from that close of a distance works better than from a laptop screen distance, I haven't tried the Tobii laptop eye tracking solution so I can't say.