Heading Assessment by "Tunnel Vision" Patients and Control Subjects Standing or Walking in a Virtual Reality Environment
Heading Assessment by "Tunnel Vision" Patients and Control Subjects Standing or Walking in a Virtual Reality Environment
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DOI：
10.1145/1227134.1227142
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发表时间：
2007-01-01
影响因子：
1.6
通讯作者：
Peli, Eli
中科院分区：
文献类型：
--
作者：
Apfelbaum, Henry;Pelah, Adar;Peli, Eli
虚拟现实运动模拟器是一种很有前途的工具，用于评估视力辅助工具对低视力人群的行动能力的有效性。本研究考察了两个因素，以深入了解测试环境的真实性要求：跑步机行走的影响和使用对照作为替代患者的适用性。10名患有色素性视网膜炎（RP）的“隧道视觉”患者被要求识别他们在虚拟环境中行走时清晰可见的障碍物的哪一侧会引导他们，并在他们做出反应时对准确性和与障碍物的距离进行评分。他们在跑步机上行走和站着观看购物中心的场景时都接受了测试。对照组受试者每人都戴着头戴式视野限制装置来模拟配对患者的视力，他们也接受了测试。在大角度接近时，对照组和患者的操作具有相当高的准确性，并且在距离障碍物相当的距离上做出选择。在狭窄的入路角度下，患者行走时的准确率提高，而对照组的准确率下降。行走时，患者和对照组都推迟了他们的决定，直到更接近障碍物。我们得出的结论是，头戴式视野限制不足以模拟隧道视觉，但与站立相比，行走性能的改善表明，行走界面（如跑步机）可能是虚拟现实运动模拟器中引出自然感知引导行为的必要条件。
Virtual reality locomotion simulators are a promising tool for evaluating the effectiveness of vision aids to mobility for people with low vision. This study examined two factors to gain insight into the verisimilitude requirements of the test environment: the effects of treadmill walking and the suitability of using controls as surrogate patients. Ten "tunnel vision" patients with retinitis pigmentosa (RP) were tasked with identifying which side of a clearly visible obstacle their heading through the virtual environment would lead them and were scored both on accuracy and on their distance from the obstacle when they responded. They were tested both while walking on a treadmill and while standing, as they viewed a scene representing progress through a shopping mall. Control subjects, each wearing a head-mounted field restriction to simulate the vision of a paired patient, were also tested. At wide angles of approach, controls and patients performed with a comparably high degree of accuracy, and made their choices at comparable distances from the obstacle. At narrow angles of approach, patients' accuracy increased when walking, while controls' accuracy decreased. When walking, both patients and controls delayed their decisions until closer to the obstacle. We conclude that a head-mounted field restriction is not sufficient for simulating tunnel vision, but that the improved performance observed for walking compared to standing suggests that a walking interface (such as a treadmill) may be essential for eliciting natural perceptually guided behavior in virtual reality locomotion simulators.