Characterising the ‘zone of good stereoscopic depth perception’ in 3d stereo displays L Ryan, S J Watt |
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School of Psychology, Bangor University, United Kingdom
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| Vergence-accommodation conflicts in 3d stereoscopic displays cause not only discomfort/fatigue, but also degraded stereoscopic depth perception. Previous research has estimated the range of conflicts that result in comfortable viewing [Shibata et al., 2011, Journal of Vision, 11(8):11]. Less is known, however, about the tolerance of perception of stereoscopic depth to vergence-accommodation conflicts, although this too is important for creating effective stereo media. We used a multiple-focal-planes stereoscopic display to present stimuli at a range of screen distances (1.3, 0.7 & 0.1 dioptres; 0.76, 1.43 & 10 m), and varied vergence-specified distance to present stimuli in-front-of and (where possible) behind the screen, creating a range of vergence-accommodation conflicts. We characterised stereo depth perception in each condition by measuring stereoacuity thresholds. Stereoacuity deteriorated similarly with conflict at all three screen distances. Performance fell off most rapidly for stereo stimuli behind the screen, suggesting there is a larger perceptual tolerance to vergence-accommodation conflicts (in dioptres) for stimuli nearer than the screen. At 1.3 D screen distance, stereoacuity ‘behind’ the screen was significantly reduced within Shibata et al.’s (2011) estimated ‘comfort zone’. This suggests that data on stereo performance, and not only discomfort, should inform the creation of optimal stereoscopic content. |
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