Sangeetha Nagarajan, Najiya Sundu K Meethal, Johan J M Pel, Rashima Asokan, Kalpa Negiloni, Ronnie George
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This study aimed to explore and label the pattern of VS based on gaze metrics quantified using eye-tracking technology.</p><p><strong>Methods: </strong>Twenty-seven glaucoma subjects and 30 healthy controls [median age 51 (14) and 54 (19) y, respectively] underwent a VS experiment during which they had to identify specific targets from real-world images. Eye movements were recorded using a remote eye-tracker and gaze metrics-fixation count (FC), fixation duration (FD), saccade amplitude (SA), and VS time (VST) were computed and compared between the study groups. A Z -score-based coefficient \" K \" was derived to label the search patterns as global ( K ≤ - 0.1: short FD with long SA), focal ( K ≥+0.1: long FD with short SA), or a combination ( K between ±0.1).</p><p><strong>Results: </strong>Similar to other ethnicities, Indian glaucoma subjects also exhibited statistically significantly increased FC, FD, and VST ( P =0.01). Healthy controls presented a comparable proportion of focal (47%) and global (42%) search patterns while glaucoma subjects exhibited predominantly focal (56%) than global search patterns (26%, P =0.008).</p><p><strong>Conclusions: </strong>This study suggests that glaucoma subjects perform more focal searches during active gaze scanning. This change in viewing behavior reflects underlying compensatory strategies adapted for coping with their visual impairments. 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On the basis of a mathematical concept we showed that due to glaucoma, focal search becomes prominent over global search.</p><p><strong>Purpose: </strong>Visual search (VS) which is essential for target identification and navigation is significantly impacted by glaucoma. VS metrics can be influenced by differences in cultural exposure or coping strategies, leading to varying VS patterns. This study aimed to explore and label the pattern of VS based on gaze metrics quantified using eye-tracking technology.</p><p><strong>Methods: </strong>Twenty-seven glaucoma subjects and 30 healthy controls [median age 51 (14) and 54 (19) y, respectively] underwent a VS experiment during which they had to identify specific targets from real-world images. Eye movements were recorded using a remote eye-tracker and gaze metrics-fixation count (FC), fixation duration (FD), saccade amplitude (SA), and VS time (VST) were computed and compared between the study groups. 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引用次数: 0
摘要
原理我们量化并比较了青光眼患者和健康对照者在目标导向型视觉搜索任务中的注视指标。目的:视觉搜索(Visual Search,VS)对目标识别和导航至关重要,而青光眼会对视觉搜索产生重大影响。VS指标会受到文化接触或应对策略差异的影响,从而导致不同的VS模式。本研究的目的是根据眼球跟踪技术量化的注视指标,探索并标注 VS 模式:27名青光眼受试者和30名健康对照组受试者(中位年龄分别为51(14)岁和54(19)岁)接受了VS实验,在实验过程中,他们必须从真实世界的图像中识别特定目标。使用远程眼动跟踪器记录眼球运动,并计算和比较研究组之间的注视指标--固定计数(FC)、固定持续时间(FD)、游走振幅(SA)和 VS 时间(VST)。通过基于 Z 值的系数 "K",将搜索模式标记为全局模式(K ≤ - 0.1:FD 短,SA 长)、焦点模式(K ≥ +0.1:FD 长,SA 短)或组合模式(K 在 +/-0.1 之间):结果:与其他种族相似,印度青光眼受试者的 FC、FD 和 VST 也明显增加(P=0.01)。健康对照组表现出相当比例的焦点搜索模式(47%)和全局搜索模式(42%),而青光眼受试者则主要表现出焦点搜索模式(56%)而非全局搜索模式(26%,P=0.008):本研究表明,青光眼受试者在主动注视扫描过程中会进行更多的焦点搜索。这种注视行为的变化反映了他们为应对视力障碍而采取的潜在补偿策略。这些搜索模式可能受到诸如显著性等因素的影响,需要进一步研究。
Characterization of Gaze Metrics and Visual Search Pattern Among Glaucoma Patients While Viewing Real-World Images.
Prcis: We quantified and compared the gaze metrics during target-oriented visual search tasks between glaucoma and healthy controls. On the basis of a mathematical concept we showed that due to glaucoma, focal search becomes prominent over global search.
Purpose: Visual search (VS) which is essential for target identification and navigation is significantly impacted by glaucoma. VS metrics can be influenced by differences in cultural exposure or coping strategies, leading to varying VS patterns. This study aimed to explore and label the pattern of VS based on gaze metrics quantified using eye-tracking technology.
Methods: Twenty-seven glaucoma subjects and 30 healthy controls [median age 51 (14) and 54 (19) y, respectively] underwent a VS experiment during which they had to identify specific targets from real-world images. Eye movements were recorded using a remote eye-tracker and gaze metrics-fixation count (FC), fixation duration (FD), saccade amplitude (SA), and VS time (VST) were computed and compared between the study groups. A Z -score-based coefficient " K " was derived to label the search patterns as global ( K ≤ - 0.1: short FD with long SA), focal ( K ≥+0.1: long FD with short SA), or a combination ( K between ±0.1).
Results: Similar to other ethnicities, Indian glaucoma subjects also exhibited statistically significantly increased FC, FD, and VST ( P =0.01). Healthy controls presented a comparable proportion of focal (47%) and global (42%) search patterns while glaucoma subjects exhibited predominantly focal (56%) than global search patterns (26%, P =0.008).
Conclusions: This study suggests that glaucoma subjects perform more focal searches during active gaze scanning. This change in viewing behavior reflects underlying compensatory strategies adapted for coping with their visual impairments. These search patterns can be influenced by factors such as saliency which requires further investigation.
期刊介绍:
The Journal of Glaucoma is a peer reviewed journal addressing the spectrum of issues affecting definition, diagnosis, and management of glaucoma and providing a forum for lively and stimulating discussion of clinical, scientific, and socioeconomic factors affecting care of glaucoma patients.