* Headaches
* Nausea
* Eye Strain
* Neck Pain
* Acne (from sitting on the same parts of your face all the time)
Etc. Also, reading text is incredibly difficult and exasperating which is this things whole value prop since it's targeting office work. Until anyone can actually try this and ensure that these are all non-issues, all the speculation is a weird cultic worship of Apple.
Just in case people forget, here's some misleading advertisements for Google Glass that didn't quite live up to the hype[0][1]. And some misleading advertisements about holo lense that didn't quite live up to the hype[2]. Full disclaimer, I have a valve index but haven't tried holo lens or Google Glass, but the fact that they're not ubiquitous today says something. It's especially funny that the holo lens looks very similar to Apple Vision, and then Apple makes these ridiculous claims about innovativing where no one else has. I swear I must be taking crazy pills or something.
[0]: https://youtu.be/4EvNxWhskf8