I don’t actually know. I tried so many variations — both straps, tight, loose, with and without my prescription lenses, Mac Virtual Display, native visionOS apps, movies, games. No matter what, I had a headache after using it for even just 10 minutes. I suppose it could be eye related, or maybe from tightening it too much on my head. Either way, I’ll have to wait for version 2 to try again. Sadly, I think it’ll be at least a year but we’ll see.