Targeting displacement as an indicator of binocular fixation in normal Chinese adults

作者：Jianqing Lan, Yingan Li, Shasha Pang, Guanrong Zhang, Dian-Peng Wu, Cheng Yang, Juan Li, Junyu Lin, Xiyang Yang, Zheng Li, Hang Chu, Yan Li, Jin Zeng · 发表于：Frontiers in Neuroscience · 年份：2023 · DOI：10.3389/fnins.2023.1124034 · 被引用次数：3 · 研究领域：Ophthalmology and Visual Impairment Studies、Visual perception and processing mechanisms、Vestibular and auditory disorders

Purpose 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. Methods 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. Result 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 ...