Vergence-accommodation conflict: Difference between revisions
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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, and the focusing distance 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. | '''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 visual fatigue and eyestrain, and vision effects that linger even after ceasing looking at the stereoscopic imagery. | It can contribute to visual fatigue and eyestrain, and vision effects that linger even after ceasing looking at the stereoscopic imagery. | ||
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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. | 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. | ||
The problem occurs because our eyes have evolved to automatically adjust their optical focus based on the perceived distance to the objects that they are looking at. This helps make focusing quick and accurate. | The problem occurs because our eyes have evolved an [https://en.wikipedia.org/wiki/Accommodation_reflex accommodation-vergence reflex], which trains them to automatically adjust their optical focus based on the perceived distance to the objects that they are looking at. This helps make focusing quick and accurate. | ||
When a virtual object appears to be mere inches in front of the user’s face, but the images of that object is, optically, several meters away, the user’s eyes may focus on the wrong distance, causing the virtual object to appear blurry. The same can happen when the virtual object is very far away, but the effect is less pronounced. | When a virtual object appears to be mere inches in front of the user’s face, but the images of that object is, optically, several meters away, the user’s eyes may focus on the wrong distance, causing the virtual object to appear blurry. The same can happen when the virtual object is very far away, but the effect is less pronounced. | ||