UNASSIGNED:固定的稳定性对于视觉功能的发展至关重要。在这项研究中,我们使用眼动追踪技术量化了注视和扫视任务中视觉目标的偏差,以一种方便的方法反映健康成年人对注视位移的控制能力和特征。
UNASSIGNED:本研究招募了100名年龄在18至55岁之间的健康参与者。所有参与者都接受了完整的眼科评估。Tobii眼睛跟踪系统记录并分析了注视和扫视任务中的眼睛位置。参与者按年龄和性别分组。目标位移(TD),定义为视觉目标与对应于该刺激的注视点的平均值之间的平均位移,用于定量观察水平和垂直方向的固定位移。
UNASSIGNED:TD作为固定指标具有很强的可重复性(ICC0.812至0.891,p<0.001)。固定任务的TD明显小于扫视任务的TD(3.884±0.525vs.正常人中4.484±0.509,p<0.001)。此外,水平和垂直经络的TD差异与任务的性质有关:在固定任务中,水平方向的TD小于垂直方向的TD(p<0.001),而扫视任务中水平的TD大于垂直的TD(p=0.003)。在不同年龄和性别组中:不同性别和年龄组在固定任务上没有显着差异。然而,在扫视任务中,男性在垂直方向的TD比女性小(4.061±0.495vs.4.404±0.484,p=0.002),平均TD随着年龄的增长而增加,主要在垂直方向(所有p<0.05)。在50岁以上的组中,固定稳定性显着下降。
UNASSIGNED:通过报告固定和扫视任务中不同性别和年龄的固定位移,以及正常人之间不同的经度线,我们的研究可能会提供一个目标,定量和方便的参考指标,用于评价视功能损害疾病和视功能老化现象的固定稳定性。
UNASSIGNED: The stability of fixation is crucial for the development of visual function. In this study, we quantify the deviation of visual target during fixational and saccadic tasks using eye-tracking technology, reflecting the control ability and characteristics of fixational displacement among healthy adults in a convenient method.
UNASSIGNED: One hundred healthy participants aged between 18 and 55 years were recruited in the study. All participants underwent a complete ophthalmic assessment. The eye positions in the fixational and saccadic tasks were documented and analyzed by the Tobii eye-tracking system. Participants were grouped by age and gender. Targeting displacement (TD), defined as the average displacement between visual target and the mean of fixation points corresponding to that stimuli, was used to quantitatively observe fixational displacement in the horizontal and vertical directions.
UNASSIGNED: There was a strong reproducibility of TD as an indicator of fixation (ICC 0.812 to 0.891, p < 0.001). The TD in fixational task was significantly smaller than that of the saccadic task (3.884 ± 0.525 vs. 4.484 ± 0.509, p < 0.001) among normal people. Moreover, the difference of TD in the horizontal and vertical meridians was related to the nature of the task: In the fixational task, the TD in horizontal was smaller than that in the vertical (p < 0.001), whereas the TD in horizontal was larger than that in vertical in the saccadic task (p = 0.003). In the different age and gender groups: There was no significant difference between different gender and age groups in fixational task. However, during the saccadic task, males had smaller TD in the vertical direction than females (4.061 ± 0.495 vs. 4.404 ± 0.484, p = 0.002), and the average TD increased with age, mainly in the vertical direction (all p < 0.05). The fixation stability decreased significantly in the group over 50-years-old.
UNASSIGNED: By reporting the fixational displacement of different genders and ages in fixational and saccadic tasks, as well as different longitude lines among normal people, our study might provide an objective, quantitative and convenient reference index for the evaluation of fixation stability in visual impairment diseases and aging phenomenon of visual function.