Abstract
In this work, we tested 12 participants on a virtual
object precision placement task while viewing a stereoscopic 3D (S3D)
display. Optometric measures of binocular function were obtained,
including measurements of distant and near phorias (horizontal and
vertical) and distant and near horizontal fusion ranges, using standard
clinical techniques. Before each of six 30-min experimental sessions,
measurements of phoria and fusion ranges were repeated. All participants
completed experimental sessions in which the task required precise
positional and rotational alignment of a virtual object in depth,
at the same location and orientation as a stationary target object.
The object was controlled by participants' spatial manipulation of
a wireless 6 degree-of-freedom (DOF) tangible user interface utilizing
magnetic spatial tracking. Subjective discomfort was assessed using
the Simulator Sickness Questionnaire (SSQ). Individual placement precision
in S3D trials was significantly correlated with several of the binocular
measures: viewers with larger convergent fusion ranges, larger divergent
fusion ranges, larger total fusion ranges, or lower (better) stereoscopic
acuity thresholds were more accurate at the task. None of the optometric
measures were predictive of individual subjective discomfort, although
a combined analysis with a similar previous experiment suggested that
a personal history with motion sickness was related to discomfort
levels from S3D viewing. The results confirm and extend previous research,
suggesting that several key optometric measurements are predictive
of complex manual spatial task performance on an S3D display system.
© 2014 IEEE
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