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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.
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[[File:Vergence accommodation conflict image.png|thumb|right|250px|Vergence-accommodation conflict in VR compared to real-world vision]]
A '''vergence-accommodation conflict''' ('''VAC'''), also known as an '''accommodation-vergence conflict''', is a phenomenon in the human visual system that occurs if the brain receives mismatching cues between [[vergence]] and [[Accommodation (eye)|accommodation of the eye]]. This commonly occurs in [[virtual reality]] devices, [[augmented reality]] devices, and binocular flat focus autostereoscopic displays. The effect can be unpleasant and cause eye strain.


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 imagery.
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 imagery.
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The natural accommodation-vergence coupling will re-establish at some point after taking off the [[HMD]]. Users might experience strange-feeling vision problems until it does.
The natural accommodation-vergence coupling will re-establish at some point after taking off the [[HMD]]. Users might experience strange-feeling vision problems until it does.
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==References==
==References==
Retrieved from "https://vrarwiki.com/wiki/Vergence-accommodation_conflict"