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One major disadvantage of VR is that, since the human brain is quite perceptive, any lag or inconsistency with the latency would cause a negative reaction, such as nausea.
Augmented Reality
What makes AR vastly different from VR is that it is designed to be part of the user’s reality instead of pulling the user into a different one.
In augmented reality, images are set up to overlap with the user’s reality and merge with it, not exactly caring whether it fits in or not. It is like adding a clear layer on top of reality and flashing digital images on it. Since the background is transparent, it would seem as if the digital image is part of reality, but the user is aware that this is not the case.
A person using an AR device could look at a major intersection and, based on the current information the device acquired, choose the fastest route to the airport by following the image flashing on the screen.
There is no active effort to fool the user’s perception. It is simply there, existing alongside the real world, not affecting it in any way, the way Google Glass is envisioned to work.
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Source: Tech Times