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A '''focal conflict''' is when a brain receives mismatching cues between eyes' accommodative [[focus]] and [[vergence]]. It results in the human brain not being sure of the distance of something. It makes it so the human brain cannot arrive at a solid determination of how far away something is. It is disorienting.

A '''focal conflict''' is when a brain receives mismatching cues between eyes' accommodative [[focus]] and [[vergence]]. It results in the human brain not being sure of the distance of something. It makes it so the human brain cannot arrive at a solid determination of how far away something is. It is disorienting.

The effect can be unpleasant and cause eye strain. This can happen with fixed-focus twosight displays, such as the [[Meta Quest]], [[Oculus Rift]], and [[HoloLens]]. Focal conflict can occur in binocular flat focus autostereoscopic displays.  

The effect can be unpleasant and cause eye strain. This can happen with fixed-focus twosight displays, such as VR headsets and AR headsets, for example the [[Meta Quest]], [[Oculus Rift]], and [[Microsoft HoloLens]]. Focal conflict can occur in binocular flat focus autostereoscopic displays.  

Focal conflict can be encountered when viewing flat-focus [[stereogram]]s, [[3D movie]]s, or [[virtual reality]] (VR). It can cause visual fatigue and headaches after a short period of time; It is one of the main contributors to [[virtual reality sickness]]. The phenomenon can make it impossible to focus on objects close to the eye in VR, limiting the development of VR software.<ref name=facebook>{{Citation |title=Vergence-Accommodation Conflict: Facebook Research Explains Why Varifocal Matters For Future VR |url=https://www.youtube.com/watch?v=YWA4gVibKJE |language=en |access-date=2022-09-26| others=This sequence of clips is taken from Douglas Lanman's talk 'Quality Screen Time: Leveraging Computational Displays for Spatial Computing' at the 33d annual Electronic Imaging Symposium (26-30 January 2020)}}</ref>

Focal conflict can be encountered when viewing flat-focus [[stereogram]]s, [[3D movie]]s, or [[virtual reality]] (VR). It can cause visual fatigue and headaches after a short period of time; It is one of the main contributors to [[virtual reality sickness]]. The phenomenon can make it impossible to focus on objects close to the eye in VR, limiting the development of VR software.<ref name=facebook>{{Citation |title=Vergence-Accommodation Conflict: Facebook Research Explains Why Varifocal Matters For Future VR |url=https://www.youtube.com/watch?v=YWA4gVibKJE |language=en |access-date=2022-09-26| others=This sequence of clips is taken from Douglas Lanman's talk 'Quality Screen Time: Leveraging Computational Displays for Spatial Computing' at the 33d annual Electronic Imaging Symposium (26-30 January 2020)}}</ref>