Use of an augmented-vision device for visual search by patients with tunnel vision
Use of an augmented-vision device for visual search by patients with tunnel vision
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DOI：
10.1167/iovs.05-1672
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发表时间：
2006-09-01
影响因子：
4.4
通讯作者：
Peli, Eli
中科院分区：
文献类型：
--
作者：
Luo, Gang;Peli, Eli
目的。研究在自然视觉上叠加缩小轮廓图像的增强视觉装置对隧道视觉患者视觉搜索性能的影响。在三种提示条件下（有设备提供的轮廓提示、有听觉提示和没有提示），12名隧道视觉受试者在空白背景下搜索呈现在视野外的目标。三名受试者（VF， 8-11宽）在90度x 74度区域内进行搜索，九名受试者（VF， 7-16宽）在66 +/- 52度区域内进行搜索。记录眼球和头部运动，用于性能分析，包括搜索路径的直接性、搜索时间和凝视速度。在大区域搜索和小区域搜索中，轮廓线索和听觉线索均显著提高了搜索路径的直接性。当使用该设备时，所有三名受试者在大范围搜索中显示出搜索时间的显著减少（28%类似于74%），而VFs大于10度的受试者在小范围搜索中显示出搜索时间的显著减少（平均22%）。直观性和注视速度占搜索时间变异性的90%。虽然该设备对于较大搜索区域的性能改善是明显的，但对于较小的搜索区域是否有帮助取决于VF和注视速度。由于直接性的改善被证明，通过进一步的训练和对设备的适应，可以提高注视速度，这可能使小vf患者在视觉搜索任务中受益于该设备。
PURPOSE. To study the effect of an augmented-vision device that superimposes minified contour images over natural vision on visual search performance of patients with tunnel vision.METHODS. Twelve subjects with tunnel vision searched for targets presented outside their visual fields (VFs) on a blank background under three cue conditions (with contour cues provided by the device, with auditory cues, and without cues). Three subjects (VF, 8-11 wide) carried out the search over a 90 degrees x 74 degrees area, and nine subjects (VF, 7-16 wide) carried out the search over a 66 +/- 52 area. Eye and head movements were recorded for performance analyses that included directness of search path, search time, and gaze speed.RESULTS. Directness of the search path was greatly and significantly improved when the contour or auditory cues were provided in the larger and the smaller area searches. When using the device, a significant reduction in search time (28% similar to 74%) was demonstrated by all three subjects in the larger area search and by subjects with VFs wider than 10 degrees in the smaller area search (average, 22%). Directness and gaze speed accounted for 90% of the variability of search time.CONCLUSIONS. Although performance improvement with the device for the larger search area was obvious, whether it was helpful for the smaller search area depended on VF and gaze speed. Because improvement in directness was demonstrated, increased gaze speed, which could result from further training and adaptation to the device, might enable patients with small VFs to benefit from the device for visual search tasks.