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首页> 外文期刊>International journal of human-computer interaction >Testing Visual Search Performance Using Retinal Light Scanning as a Future Wearable Low Vision Aid
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Testing Visual Search Performance Using Retinal Light Scanning as a Future Wearable Low Vision Aid

机译：使用视网膜光扫描作为未来可穿戴的低视力辅助工具测试视觉搜索性能

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摘要

For the goal of designing a wearable low vision aid, aspects of both head-mounted display (HMD) design and performance evaluation were integrated into a single study of scanning ability. A head-mounted version of a novel retinal light scanning display known as the virtual retinal display was fabricated for this study. A remote head CCD (charge coupled device) attached approximately at the user's line of sight was used as the input source. Scanning ability was quantified as the time to identify a target in a wide field of distractors while using the HMD design in four different display interface modes (DIMs). Each DIM was tested with respect to their corresponding controls: A (augmented, see-through) and CO (center occluded) DIMs were compared to the augmented control (augmented, retinal display turned off), and CPO (center and periphery occluded) and PO (periphery occluded) DIMs were compared to the periphery occluded control (periphery obstructed, retinal display turned off). Each DIM was tested at high, medium, and low contrast levels. Five subjects were tested without optical correction (visual acuity worse than 20/200), which accurately represented low vision subjects. Results showed that for each DIM, scanning performance decreased as the contrast level decreased. At the lowest contrast level, the PO DIM provided the greatest and most significant improvement in scanning performance. At the medium and highest contrast levels, all DIMs provided equal or worse performance than their controls. Additionally, the subjects' natural visual acuity showed no correlation with scan time. All subjects reported a higher acuity with the retinal display, and showed a diverse range of preference for the most helpful DIM. Based on these results, we realized that low vision applications have unique design requirements unlike those for normally sighted users, and therefore customization of a wearable low vision aid may be an optimal design strategy.
机译：为了设计可穿戴的低视力辅助设备，将头戴式显示器（HMD）设计和性能评估的各个方面都整合到了一项扫描能力研究中。本研究制造了一种新型的视网膜光扫描显示器的头戴式版本，称为虚拟视网膜显示器。大约安装在用户视线处的远程头CCD（电荷耦合器件）被用作输入源。扫描能力被量化为在四个不同的显示界面模式（DIM）中使用HMD设计时在宽范围的干扰物上识别目标的时间。对每个DIM进行了相对应的对照测试：将A（增强的，透视的）和CO（封闭的中心）的DIM与增强的对照（增强的，关闭视网膜的显示），CPO（中心和周围的封闭）进行比较。将PO（周围阻塞）DIM与周围阻塞对照（周围阻塞，视网膜显示关闭）进行了比较。每个DIM均在高，中和低对比度水平下进行了测试。测试了五名受试者，未进行光学矫正（视力低于20/200），这些矫正准确地代表了低视力受试者。结果表明，对于每个DIM，扫描性能会随着对比度水平的降低而降低。在最低的对比度水平上，PO DIM在扫描性能方面提供了最大，最显着的改进。在中等和最高对比度水平下，所有DIM都提供了比其控件相同或更差的性能。此外，受试者的自然视力与扫描时间没有相关性。所有受试者的视网膜显示都具有较高的敏锐度，并且对最有用的DIM表现出不同的偏好范围。根据这些结果，我们意识到低视力应用程序对正常视力用户的要求与众不同，因此定制可穿戴式低视力辅助设备可能是一种最佳设计策略。

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