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[[File:VAC segment.png|thumb|right|300px|Vergence-focus conflict]]
[[File:VAC segment.png|thumb|right|300px|Vergence-focus conflict]]
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A '''vergence-focus conflict''' is a conflict in the human perceptual system that occurs if the brain receives mismatching cues between eyes' [[vergence]] and [[focus]]. This can happen with fixed-focus biscopic displays. The effect can be unpleasant and cause eye strain.
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'''Focal conflict''' is when a brain receives mismatching cues between eyes' [[focus]] and [[vergence]]. This can happen with fixed-focus biscopic displays. The effect can be unpleasant and cause eye strain.
This can occur in [[virtual reality]] devices, [[augmented reality]] devices, and binocular flat focus autostereoscopic displays.
This can occur in [[virtual reality]] devices, [[augmented reality]] devices, and binocular flat focus autostereoscopic displays.