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Virtual Reality Based Assessment of Static Object Visual Search in Ocular Compared to Cerebral Visual Impairment

机译:与大脑视觉障碍相比,基于虚拟现实的眼内静态对象视觉搜索评估

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Virtual reality (VR) can provide robust assessment of cognitive spatial processing skills in individuals with visual impairment. VR combined with objective measures of behavioral performance, such as eye and hand tracking, affords a high degree of experimental control, task flexibility, participant engagement, and enhanced data capture. Individuals with visual impairment typically have difficulties identifying objects in a cluttered environment. Furthermore, these difficulties may differ depending on the type of visual impairment. Specifically, individuals with cortical/cerebral visual impairment (CVI) may show a greater sensitivity to visual task complexity compared to those with ocular based visual impairment (OVI). We have developed a VR environment with integrated eye and hand tracking to simulate exploring a toy box to assess performance on a static object-based visual search task. A grid of toys was displayed for a brief duration while participants found and fixated on a specific toy hidden among others. For a given trial, we manipulated multiple factors: the number of unique distractor toys, a color/theme matched toy, and the background clutter. Results to date show that both visually impaired groups demonstrate increased variability in search patterns and reaction times as compared to controls. Additionally, performance of the CVI group fluctuates greatly as a function of task difficulty. Findings from the current work demonstrate a successful interaction between individuals with visual impairments and VR simulations in assessing high level visual function. Further studies will serve as theoretical foundation for the creation of new assessment and training paradigms for visually impaired individuals.
机译:虚拟现实(VR)可以对视力障碍患者的认知空间处理技能提供可靠的评估。 VR与诸如眼球和手部追踪之类的行为表现的客观度量相结合,提供了高度的实验控制,任务灵活性,参与者参与度和增强的数据捕获能力。视力障碍的人通常很难在混乱的环境中识别物体。此外,根据视力障碍的类型,这些困难可能会有所不同。具体而言,与基于眼的视觉障碍(OVI)的人相比,具有皮质/脑部视觉障碍(CVI)的人可能对视觉任务的复杂性表现出更高的敏感性。我们已经开发了具有集成的眼睛和手部跟踪功能的VR环境,可以模拟探索玩具箱的性能,以评估基于静态对象的视觉搜索任务的性能。短时间内展示了一个玩具网格,而参与者发现并固定在一个隐藏在其中的特定玩具上。对于给定的试验,我们操纵了多个因素:独特的干扰物玩具的数量,颜色/主题匹配的玩具以及背景混乱。迄今为止的结果表明,与对照组相比,两个视障者组均表现出搜索方式和反应时间的变异性增加。此外,CVI小组的绩效会因任务难度而大幅波动。当前工作的发现表明,在评估高级视觉功能时,视力障碍者和VR模拟之间可以成功地进行交互。进一步的研究将为为视障人士创建新的评估和培训范例提供理论基础。

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