Changes

[[File:Chromostereopsis.png|thumb|200px|Focal conflict due to [[chromostereopsis]]. Look at this image in full screen and feel the eye strain.]]

[[File:Chromostereopsis.png|thumb|200px|Focal conflict due to [[chromostereopsis]]. Look at this image in full screen and feel the eye strain.]]

A '''vergence-accommodation conflict''', also known as a '''focal conflict''', is when a brain receives mismatching cues between eyes' [[focus]] and angle. It is disorienting and can result in eye and brain pain. The effect can be unpleasant and cause eye strain.

A '''vergence-accommodation conflict''' is when a brain receives mismatching cues between eyes' [[focus]] and angle. It is disorienting and can result in eye and brain pain. The effect can be unpleasant and cause eye strain.

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>