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首页> 外文期刊>Restorative Neurology and Neuroscience >Inverse stimuli in perimetric performance reveal larger visual field defects: Implications for vision restoration
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Inverse stimuli in perimetric performance reveal larger visual field defects: Implications for vision restoration

机译：视野功能的反向刺激揭示更大的视野缺损：对视力恢复的影响

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Abstract. Purpose: When studying the efficacy of vision restoration training (VRT), near-threshold and super-threshold perimetrynrevealed visual field enlargements whereas the Scanning Laser Ophthalmoscope (SLO) did not. Because the SLO procedurendiffers in many parameters from the other perimetric tests (task difficulty, inability to reveal relative defects, inverse stimulusnpresentation, bright red background) the question arises which of these parameters might be responsible for such discrepanciesnin outcome. We have therefore simulated with a computer-based campimetry test some of the SLO parameters and comparednperformance with that in standard perimetry.nMethods: A 46-year old female patient was evaluated with computer-based high resolution perimetry (HRP) using detection tasksnof “positive” (bright) stimuli on grey background. Performance was compared with an SLO-like task using “inverse” black targetnstimuli on red background.nResults: Detection rate was 89% when the stimuli were positive (HRP) but dropped to 79.6% and 80.4% in the SLO-like “inverse”nstimulation mode with red background, and striped red background, respectively. The number of false positives increased fromn8.5 when a grey background was used, to 9.8 and 9.5 for plain red and striped red background, respectively. Reaction times werenprolonged from 384 ms using a grey background to 412 ms and 391 ms using a plain red and striped red background, respectively.nThus, visual fields tested with SLO-like “inverse” stimuli showed larger scotomata and prolonged reaction time.nConclusions: Inverse stimulus detection on red background is apparently a more difficult task for hemianopic patients thannstandard perimetric protocols (such as those used in Tuebinger Automatic Perimetry or HRP). The difference in stimulus featuresnmight explain why VRT-induced visual field enlargements could not be observed with the SLO. Our findings also suggest thatnvision restoration training does not improve all aspects of vision, such as inverse, chromatic stimulus detection.
机译：抽象。目的：在研究视力恢复训练（VRT）的效果时，近阈值和超阈值视野检查显示的视野扩大，而扫描激光检眼镜（SLO）则没有。由于SLO程序与其他视野测试的参数有所不同（任务难度，无法揭示相对缺陷，反向刺激表示，鲜红色背景），因此出现了这些参数中哪些可能导致这种差异的问题。因此，我们使用基于计算机的比色法测试进行了一些SLO参数的模拟，并将其与标准视野仪的性能进行了比较。n方法：使用计算机高分辨率高分辨率视野仪（HRP）对46岁的女性患者进行了“阳性”检测任务评估。 （明亮）在灰色背景上的刺激。将性能与在红色背景上使用“反向”黑色目标刺激的SLO样任务进行比较。n结果：当刺激为阳性（HRP）时，检出率为89％，而在SLO样“反向”刺激下，检出率降至79.6％和80.4％。 ns刺激模式分别为红色背景和条纹红色背景。误报的数量从使用灰色背景时的n8.5增加到纯红色和条纹红色背景时的9.8和9.5。反应时间没有从使用灰色背景的384毫秒延长到使用纯红色和条纹红色背景的412毫秒和391毫秒。n因此，使用类似SLO的“反向”刺激测试的视野显示出更大的盲孔和延长的反应时间。n结论：对于偏盲患者，红色背景上的反向刺激检测显然比标准的视野检查协议（例如Tuebinger自动视野检查或HRP中使用的协议）更加困难。刺激特征的差异可能解释了为什么SLO无法观察到VRT引起的视野扩大。我们的发现还表明，nvision修复训练并不能改善视觉的所有方面，例如反向，彩色刺激检测。

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