December 2022
Volume 22, Issue 14
Open Access
Vision Sciences Society Annual Meeting Abstract  |   December 2022
Measuring Upright Perception and Torsional Eye Position in Virtual Reality
Author Affiliations & Notes
  • Josephine D'Angelo
    Herbert Wertheim School of Optometry and Vision Science, University of California, Berkeley
  • Raul Rodriguez
    Herbert Wertheim School of Optometry and Vision Science, University of California, Berkeley
  • Stephanie Reeves
    Herbert Wertheim School of Optometry and Vision Science, University of California, Berkeley
  • Jorge Otero-Millan
    Herbert Wertheim School of Optometry and Vision Science, University of California, Berkeley
    Department of Neurology, The Johns Hopkins University
  • Footnotes
    Acknowledgements  Project was funded by NEI Training grant 5T32EY007043-43 and NEI R00EY027846
Journal of Vision December 2022, Vol.22, 3817. doi:https://doi.org/10.1167/jov.22.14.3817
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      Josephine D'Angelo, Raul Rodriguez, Stephanie Reeves, Jorge Otero-Millan; Measuring Upright Perception and Torsional Eye Position in Virtual Reality. Journal of Vision 2022;22(14):3817. https://doi.org/10.1167/jov.22.14.3817.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

When viewing the world, we perceive a stable upright image. This upright perception is maintained despite our eyes, head, neck, and body continuously moving. When the head tilts, the eyes roll in the opposite direction of the head tilt and this reflex is called ocular counter-roll (OCR) or torsion. Tilting the head typically increases errors in upright perception which can be measured using the subjective visual vertical (SVV) task. It has been shown that convergence suppresses OCR when looking at near objects. Here we wanted to take advantage of new virtual reality technology to study the interaction between head tilt and convergence on perception of upright and ocular counter-roll. Three subjects were tested using the FOVE VR headset. We used a subjective visual vertical (SVV) task to measure their upright perception while simultaneously recording torsional eye position at three head positions: upright, head roll 30 degrees left, and head roll 30 degrees right. At each of the head positions we also tested SVV at two vergence distances: near (25 cm) and far (1.5 m). We scaled to maintain constant size in degrees of visual angle at different distances. In the current configuration we did not observe a difference in the amount of ocular counter-roll observed with head tilt during near and far viewing. Perception of upright also did not appear to differ between viewing conditions and head tilts. Our results may suggest that the mechanisms by which near viewing suppresses OCR may not apply under the current VR configuration.

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