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VR still has to solve the parallax problem before it will ever be a ubiquitous form of tech. Most users still report headaches after a couple-few 10's of minutes of use.
The parallax problem is due to the fact that VR can make 3D images, with objects appearing to be at different distances, but the focal convergence of the angle of our eyes (think going cross-eyed to see something very close) never changes.
It's not the focal length, which is the amount the lenses in our eyes need to change shape to focus on near vs far things. It's the fact that to see things far away, the eyes are mostly pointed in parallel directions. To see things close up, the eye's looking directions converge and you become more and more cross-eyed.
Our eyes/brains seem OK with the fact that the focal length of the objects seems to be the same distance, but not OK with the fact that our eyes don't have to change their relative angle to see the close / far things.
Not everyone reports feeling headaches when using VR, so if you don't, this doesn't matter to you. It's the expected norm for users at this time, though. I expect we'll tech around this issue eventually, but I don't see how we're going to do it with current tech.
EDIT: Augmented reality glasses are probably closer to the market. They let the eyes see plenty of stuff at actual distance, and only the overlays are "weird" in that way.
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