Have there been many cases of this? I mean, I know people who can't wear 3D glasses for long, people who can't stay in front of a computer screen for very long

Have there been many cases of this? I mean, I know people who can't wear 3D glasses for long, people who can't stay in front of a computer screen for very long and so on. So is it a problem with the technology? On an unrelated note: Does anybody know when Glass will be available in other countries? I've been interested in obtaining a pair for a while but I'm not sure how to go about it.