October 2020
Volume 20, Issue 11
Open Access
Vision Sciences Society Annual Meeting Abstract  |   October 2020
The effect of head- and stimulus tilt on stereoacuity
Author Affiliations & Notes
  • Jan Skerswetat
    Northeastern University, USA
  • Andrea Caoli
    Northeastern University, USA
    Università degli Studi di Genova, Italy
  • Peter Bex
    Northeastern University, USA
  • Footnotes
    Acknowledgements  This research was funded by the National Institutes of Health (R01 EY029713 awarded to author P.J.B.). The authors declare no conflict of interests.
Journal of Vision October 2020, Vol.20, 1570. doi:https://doi.org/10.1167/jov.20.11.1570
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      Jan Skerswetat, Andrea Caoli, Peter Bex; The effect of head- and stimulus tilt on stereoacuity. Journal of Vision 2020;20(11):1570. https://doi.org/10.1167/jov.20.11.1570.

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

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Abstract

Stereopsis is traditionally measured by using stereo tests that are presented upright while the observer views the test in a habitual head position. Here, we investigated the effect of head-and stimulus tilt on stereoacuity. First, we measured stereoacuity using a 4AFC bandpass-filtered circles(size=1.25; sf=4cyl/) on a passive-3-D-monitor with enforced eye-and head positions. Head tilts were 0 or 20 pitch, roll, or yaw. Ten binocularly normal(Titmus 60’’ or better) adults fixated a central cross and clicked on the circle with a backwards depth for forty trials/condition. Stereoacuity thresholds(62.5% cumulative-Gaussian-fit) worsened with tilt, but did not significantly differ from the 0 condition[p>0.05]. Next, we measured stereoacuity while either the head(H), monitor(M), or both(B) were tilted 0, 22.5, or 45 roll in random order (eighty trials/condition). The stimulus size was 8, made of four quadrants, each containing 0.04 Gaussian dots(30dots/-2). Interocular disparity was Gaussian(=0.67), convex in three and concave in one quadrant. The task for eight participants was to click on the concave target. There was a significant interaction between conditions and tilts[p<0.05], which was due to decreasing stereoacuities with increasing tilt for conditions H and M[p<0.05], but not B[p>0.05]. Stereoacuities for M tended to be worse than for H, but this trend was not significant[p = 0.084]. The decrease in stereoacuity with tilt was greater for left- compared to right-roll(M=1.3 vs. 1.1”/[p=0.001]; H=1.1 vs. 0.8”/[p=0.01]; B=0.09 vs. 0.05”/[p=0.23], respectively). Stereoacuities were unaffected by head tilt using sparse-circles, but significantly changed using dot stimuli, indicating a role for stimulus density in depth perception assessment. Cyclotorsions have a negligible effect on stereoacuity since there was no effect of tilt in B nor a significant difference between H and M. Rolling the head leftwards generates poorer stereoacuities than rightwards. The results may have implications for clinical screening in patients with abnormal head posture.

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