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The human visual system has not evolved to view fixed-focus biscopic stereograms. Focal conflict can be a very unpleasant sensation for the viewer.<ref>{{Cite journal |title=The zone of comfort: Predicting visual discomfort with stereo displays |url=https://jov.arvojournals.org/article.aspx?articleid=2121032 |journal=Jov ArvoJournals |volume=11 |issue=8}}</ref><ref>{{Cite journal |last1=Wann |first1=John P. |last2=Mon-Williams |first2=Mark |date=May 1997 |title=Health issues with virtual reality displays: what we do know and what we don't |url=https://dl.acm.org/doi/10.1145/271283.271307 |journal=ACM SIGGRAPH Computer Graphics |language=en |volume=31 |issue=2 |pages=53–57 |doi=10.1145/271283.271307 |s2cid=17366319 |issn=0097-8930}}</ref><ref>{{Cite journal |date=March 2008 |title=Vergence–accommodation conflicts hinder visual performance and cause visual fatigue |url=https://jov.arvojournals.org/article.aspx?articleid=2122611 |journal=JOV Arvo Journals |volume=8 |issue=3}}</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>
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 is very difficult to overcome when designing new types of [[3D display]]s.<ref name=facebook />
Focal conflict is very difficult to overcome when designing new types of [[3D display]]s.<ref name=facebook />