"because you can’t immerse people as much in the environment then if you don’t have the entire real world blocked out,” Quarles said:NSF Spends $195K to Study Cybersickness in Virtual Reality Physical Rehab

That's like saying "How can I drown you if you don't let me submerge your nose AND mouth!"

When will they figure out this fully immersive "Presence" that the genius supposedly discovered is at best a delusion and at worst a hoax. Certain people want this so badly they refuse to accept the obvious.

"In virtual reality physical therapy, patients could wear goggles, or even be placed in front of a big screen, Quarles said. In some cases, patients use a fully immersive head-mounted display, which can be problematic, because it can make those with disabilities more susceptible to falls.

“It’s similar to what happens when if you have balance issues and you close your eyes, then there’s a significantly higher chance that you’re just gonna fall over and not necessarily realize that you’re falling over,” he said.

“So one of the things is we have to unblock the periphery or the sides of the head mounted display, which is kind of annoying, because you can’t immerse people as much in the environment then if you don’t have the entire real world blocked out,” Quarles said."

http://cnsnews.com/news/article/melanie-hunter/nsf-spends-195k-study-cybersickness-virtual-reality-physical-rehab