Human fixational eye movements are so small and precise that high-speed, accurate tools are needed to fully reveal their properties and functional roles. Where the fixated image lands on the retina and how it moves for different levels of visually demanding tasks is the subject of the current study. An Adaptive Optics Scanning Laser Ophthalmoscope (AOSLO) was used to image, track and present a variety of fixation targets (Maltese cross, disk, concentric circles, Vernier and tumbling-E letter) to healthy subjects. During these different passive (static) or active (discriminating) tasks under natural eye motion, the landing position of the target on the retina was tracked in space and time over the retinal image directly with high spatial (<1 arcmin) and temporal (960 Hz) resolution. We computed both the eye motion and the exact trajectory of the fixated target's motion over the retina. We confirmed that compared to passive tasks, active tasks elicited a partial inhibition of microsaccades, leading to longer drift periods compensated by larger corrective saccades. Consequently, the overall fixation stability during active tasks was on average 57% larger than during passive tasks. The preferred retinal locus of fixation was the same for each task and did not coincide with the location of the peak cone density.

中文翻译：

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被动与主动持续注视任务中的注视眼球运动。

人类注视眼球运动是如此的小而精确，以至于需要高速、精确的工具来充分揭示它们的特性和功能作用。固定图像在视网膜上的位置以及它如何为不同级别的视觉要求任务移动是当前研究的主题。自适应光学扫描激光检眼镜 (AOSLO) 用于对健康受试者成像、跟踪和呈现各种注视目标（马耳他十字、圆盘、同心圆、游标和翻滚-E 字母）。在自然眼球运动下的这些不同的被动（静态）或主动（辨别）任务期间，目标在视网膜上的着陆位置直接在视网膜图像上以高空间（<1 arcmin）和时间（960赫兹）分辨率。我们计算了眼睛运动和固定目标在视网膜上运动的确切轨迹。我们证实，与被动任务相比，主动任务引起了微跳的部分抑制，导致更长的漂移期被更大的纠正扫视补偿。因此，主动任务期间的整体固定稳定性平均比被动任务期间大 57%。每个任务的首选视网膜固定点都相同，并且与峰值锥体密度的位置不一致。主动任务期间的整体固定稳定性平均比被动任务期间大 57%。每个任务的首选视网膜固定点都相同，并且与峰值锥体密度的位置不一致。主动任务期间的整体固定稳定性平均比被动任务期间大 57%。每个任务的首选视网膜固定点都相同，并且与峰值锥体密度的位置不一致。