Finely tuned eye movements enhance visual acuity
Finely tuned eye movements enhance visual acuity
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DOI：
10.1038/s41467-020-14616-2
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发表时间：
2020-02-07
影响因子：
16.6
通讯作者：
Rucci, Michele
中科院分区：
文献类型：
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作者：
Intoy, Janis;Rucci, Michele
高视力对于许多任务都是必不可少的，从识别远方的朋友到驾驶汽车。虽然人们对眼睛的光学和解剖结构如何影响空间分辨率已经了解很多，但很少考虑眼睛运动的可能影响。然而，人类不断地移动他们的眼睛，长期以来，人们一直认为眼球活动增强了精细图案视觉。在这里，我们研究的作用，眼球运动中最常见的评估视力，斯内伦视力表。通过精确定位凝视和积极控制视网膜刺激，我们发现，注视行为提高视力超过0.15 logMAR，至少2行的斯内伦图表。这种改进是通过调整微扫视和眼漂移来精确地将图像定位在视网膜上并调整其运动来实现的。这些发现表明，人类微调他们的注视眼球运动，使他们大大有助于正常的视力。
High visual acuity is essential for many tasks, from recognizing distant friends to driving a car. While much is known about how the eye's optics and anatomy contribute to spatial resolution, possible influences from eye movements are rarely considered. Yet humans incessantly move their eyes, and it has long been suggested that oculomotor activity enhances fine pattern vision. Here we examine the role of eye movements in the most common assessment of visual acuity, the Snellen eye chart. By precisely localizing gaze and actively controlling retinal stimulation, we show that fixational behavior improves acuity by more than 0.15 logMAR, at least 2 lines of the Snellen chart. This improvement is achieved by adapting both microsaccades and ocular drifts to precisely position the image on the retina and adjust its motion. These findings show that humans finely tune their fixational eye movements so that they greatly contribute to normal visual acuity.