Methodology for the Iterative Evaluation of Prototype Head-Mounted Displays in Virtual Environments: Visual Acuity Metrics

Fidopiastis, Cali M.; Fuhrman, Christopher A.; Meyer, Catherine C.; Rolland, Jannick P.

doi:10.1162/105474605774918697

Cited by 12 publications

(13 citation statements)

References 13 publications

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“…Despite recent progress in 3D projection technology, an artificial computer-generated VE distorts visual perception [40]. Observing the environment via goggles typically reduces the field of view, limits the visual resolution acuity, and affects the natural accommodation and vergence mechanisms of the human gaze system, thereby degrading depth cue information [41].…”

Section: Discussionmentioning

confidence: 99%

Does use of a virtual environment change reaching while standing in patients with traumatic brain injury?

Schafer

Ustinova

2013

Journal of NeuroEngineering and Rehabilitation

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BackgroundAlthough numerous virtual reality applications have been developed for sensorimotor retraining in neurologically impaired individuals, it is unclear whether the virtual environment (VE) changes motor performance, especially in patients with brain injuries. To address this question, the movement characteristics of forward arm reaches during standing were compared in physical and virtual environments, presented at different viewing angles.MethodsFifteen patients with traumatic brain injuries (TBI) and 15 sex- and age-matched healthy individuals performed virtual reaches in a computer-generated courtyard with a flower-topped hedge. The hedge was projected on a flat screen and viewed in 3D format in 1 of 3 angles: 10° above horizon (resembling a real-world viewing angle), 50° above horizon, or 90° above horizon (directly overhead). Participants were instructed to reach with their dominant hand avatar and to touch the farthest flower possible without losing their balance or stepping. Virtual reaches were compared with reaches-to-point to a target in an equivalent physical environment. A set of kinematic parameters was used.ResultsReaches by patients with TBI were characterized by shorter distances, lower peak velocities, and smaller postural displacements than reaches by control individuals. All participants reached ~9% farther in the VE presented at a 50° angle than they did in the physical environment. Arm displacement in the more natural 10° angle VE was reduced by the same 9-10% compared to physical reaches. Virtual reaches had smaller velocity peaks and took longer than physical reaches.ConclusionThe results suggest that visual perception in the VE differs from real-world perception and the performance of functional tasks (e.g., reaching while standing) can be changed in TBI patients, depending on the viewing angle. Accordingly, the viewing angle is a critical parameter that should be adjusted carefully to achieve maximal therapeutic effect during practice in the VE.

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Section: Discussionmentioning

confidence: 99%

Does use of a virtual environment change reaching while standing in patients with traumatic brain injury?

Schafer

Ustinova

2013

Journal of NeuroEngineering and Rehabilitation

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“…Additional sources included work of 19th century psychologist and physiologist Hermann Von Helmholtz and papers from the journal Presence: Teleoperators & Virtual Environments [4][5][6][7][8] .…”

Section: Presence and Object Telepresencementioning

confidence: 99%

Human factors issues in the design of stereo-rendered photorealistic objects: a stereoscopic Turing test

2010

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We present visual acuity metrics, human factors issues, and technical considerations in the construction of a stereorendered reality test in the spirit of the Turing test, Alan Turing's famous artificial intelligence test designed to explore the boundaries between human and machine interaction. The overall aim of this work is to provide guiding principles in the design of a stereoscopic reality test.

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“…Evaluation of a head-mounted projection display (HMPD) was done with a modified Landolt-C acuity test [6]. This test asked users to identify the direction of an opening in a square (up, down, left, or right) under three levels of light.…”

Section: Visual Perception In Head-worn Displaysmentioning

confidence: 99%

Quantification of visual capabilities using augmented reality displays

Livingston¹

2006

2006 IEEE/ACM International Symposium on Mixed and Augmented Reality

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In order to be able to perceive and recognize objects or surface properties of objects, one must be able to resolve the features. These perceptual tasks can be difficult for both graphical representations and real objects in augmented reality (AR) displays. This paper presents the results of objective measurements and two user studies. The first evaluation explores visual acuity and contrast sensitivity; the second explores color perception. Both experiments test users' capabilities with their natural vision against their capabilities using commercially-available AR displays. The limited graphical resolution, reduced brightness, and uncontrollable visual context of the merged environment demonstrably reduce users' visual capabilities. The paper concludes by discussing the implications for display design and AR applications, as well as outlining possible extensions to the current studies.

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Methodology for the Iterative Evaluation of Prototype Head-Mounted Displays in Virtual Environments: Visual Acuity Metrics

Cited by 12 publications

References 13 publications

Does use of a virtual environment change reaching while standing in patients with traumatic brain injury?

Does use of a virtual environment change reaching while standing in patients with traumatic brain injury?

Human factors issues in the design of stereo-rendered photorealistic objects: a stereoscopic Turing test

Quantification of visual capabilities using augmented reality displays

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