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'''Vergence-accommodation conflict''', also known as '''VAC''', or '''Accommodation-vergence conflict''', occurs when your brain receives mismatching cues between the distance of a virtual 3D object ([https://en.wikipedia.org/wiki/Vergence vergence]), and the focusing distance ([https://en.wikipedia.org/wiki/Accommodation_(eye) accomodation]) required for the eyes to focus on that object. This occurs while looking at stereoscopic imagery, such as watching 3D TV/cinema, as well as in all current, traditional [[HMD]]s.
It can contribute to focusing problems, visual fatigue , and eyestrain, while looking at stereoscopic imagery, and vision effects that linger even after ceasing looking at the stereoscopic imagery.
In traditional stereoscopic technologies, the virtual image is focused at a fixed depth away from the
eyes, while the depth of the virtual objects, and the amount of binocular disparityeye convergence, varies depending upon the content.
The problem is less severe in 3D TV/cinema, when it is properly taken into account during content creation and display. Part of the reason it's less severe, is that the 3D objects are never close to the viewer.
