Merely the minutest lag when rotating your head can cause nausea in a statistically significant number of people.

Any VR absolutely does cause sweaty forehead symptom for me. It’s just my different biology I guess.

> The disconnect from the world is the only one that doesn't have a solution yet AFAIK.

The solution is AR. I would use a Microsoft hololens, if it was available at a reasonable price point.

> Merely the minutest lag when rotating your head can cause nausea in a statistically significant number of people

Do you have a source for that? The lag issue seems entirely solved now, on a device like the Quest 2, it was an issue only in earlier days with slower hardware.

There were lots of different theories early on, but now the cause of nausea seems to be entirely based on motion over a large field of view, which causes a disconnect between your inner ear telling you you're not moving, and your eyes telling you you are. Hence why VR games generally default to teleporting rather than walking/running.

(There can be separate issues such as eyestrain if your IPD doesn't match or relating to wearing glasses, but those are device-specific.)

> The solution is AR. I would use a Microsoft hololens, if it was available at a reasonable price point.

Interesting, the Quest Pro is I believe aimed at the same audience as the HoloLens, but at a lower price point. Though, not fully AR - more like MR I believe.

Pass-through VR headsets will never, ever meet the use cases I have in mind, like integrated virtual HUDs for pilots or machinery operators, or even construction workers on large building sites. Going blind due an equipment failure while operating tons of moving machinery is not a reasonable failure mode.

And speaking personally, I just don't want to be disconnected from the environment in which I am presently existing. Projected overlays on glasses could be useful, I'll grant, but not a vision-restricting, self-isolating VR headset.

> Projected overlays on glasses could be useful, I'll grant

That's what they are aiming for long-term. Zuckerberg said in the Connect talk that glasses would be the ideal form factor.

My experience is that spacers or not, using these with glasses is uncomfortable. Adding prescription inserts are more comfortable and provide a better visual experience. I bought some very cheap glasses and 3d printed the inserts. They have magnetic mounts and you can remove them easily.