February 2016
Volume 16, Issue 4
Open Access
OSA Fall Vision Meeting Abstract  |   February 2016
Assessing Patients with Central Field Loss Using a Low-Cost Virtual Reality System with Head Tracking
Author Affiliations
  • Giovanni Fusco
    The Smith-Kettlewell Eye Research Institute
  • Natela Shanidze
    The Smith-Kettlewell Eye Research Institute
  • Preeti Verghese
    The Smith-Kettlewell Eye Research Institute
Journal of Vision February 2016, Vol.16, 40. doi:10.1167/16.4.40
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      Giovanni Fusco, Natela Shanidze, Preeti Verghese; Assessing Patients with Central Field Loss Using a Low-Cost Virtual Reality System with Head Tracking. Journal of Vision 2016;16(4):40. doi: 10.1167/16.4.40.

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

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Abstract

Central visual field loss is a common and debilitating problem, especially among the elderly. These individuals experience significant difficulties in performing daily tasks, and navigating streets is both challenging and potentially hazardous. The recent development of low-cost virtual reality (VR) technologies provides a potential assessment and training platform that emulates many aspects of daily life, without the associated risks. We introduce a novel testing environment with both monocular and binocular cues to depth, using a custom handheld VR simulation on an Android smartphone. Five CFL patients and 1 age-matched control were included in the study. Participants were asked to wear a VR headset. Each session consisted of two parts. First, acuity was tested in the VR device, using single letters whose size was controlled by a 2 up-1 down staircase, until threshold was reached. The threshold letter size was used for the rest of the experiment. In the second part, patients were presented with a looming wagon-wheel stimulus in fovea-centered coordinates. Observers reported the number of spokes (3, 5, or 7 randomly assigned) when the wagon wheel came into view and then identified a letter in the center, while interacting with the device via provided levers. Head movements could be resolved to a fraction of a degree, and were clearly evident in switching between the centering task (wagon wheel) and fixational task (letter identification) for the participant with a very eccentric fixation locus. All participants found the tasks compelling and engaging, reporting no motion sickness or other discomfort.

Footnotes
 Giovanni Fusco was supported by The Administration for Community Living's National Institute on Disability, Independent Living and Rehabilitation Research Grant No. 90RE5008-01-00.  Natela Shanidze was supported by NIH Grant No. F32 EY025151  Preeti Verghese was supported by NIH Grant No. R01 EY022394
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