The article talks about this new type of gaming technology that you put over your eyes to view a t.v. screen. This gives you the sensation that you are actually in an alternate universe. You are also able to move around a do things within this alternate universe, such a climb up ladders by clawing at the air. They mentioned in the article that one thing they found out quickly was that people will be unable to play fast paced games, or ones that are hard of the eyes because it makes the player physically ill.
Although this is only talked about in a gaming sense, I feel that it could also play a big role in virtual reality, such as for virtual worlds like SL.