SCI TOP 10

当前位置:首页>SCI TOP 10

知觉学习改善了近视视觉的神经处理过程

Yan FF, Zhou J, Zhao W

期刊名称:J VISION 视觉杂志

卷期:第15卷(2015年)10期

关键词:

刘陇黔 教授

 刘陇黔  教授   四川大学华西医院

视觉功能是由眼睛的光学传输质量和视觉系统神经加工共同决定的。该研究认为知觉学习所改善的视觉系统的神经加工可弥补轻、中度近视所导致的眼睛的光学缺陷,从而提高视功能(视力和对比敏感度),但并不能改善眼睛的光学缺陷(屈光度)。由此可见,对于屈光系统已发育成熟的成人,通过知觉学习可能在一定程度上取代近视眼的光学矫正,但对于尚在发育的儿童来说,知觉学习并不能代替光学矫正。

为TA点赞

摘要

 视觉性能由眼睛的光学传输质量和视觉系统的神经处理过程共同决定。那么,产生一个开放性的问题,即:视觉缺陷的影响能够通过神经处理过程的知觉学习加以补偿吗?为了解决这个问题,我们针对高频缺陷对23名近视观察者开展了一项知觉学习研究,让观察者们的那只接近他们各自截止空间频率的非主导眼参与一项单眼光栅检测任务来对他们进行培训。对训练组所有观察者的双眼(未矫正视力)进行训练前和训练后的对比敏感度函数和视力情况评估,而对照组的所有观察者在两次评估过程中在测试与测试之间都间隔10天。此外,对训练组的5名观察者测定训练前后的阈值与外噪声对比函数。我们发现,(a)知觉训练可以显著改善双眼在所训练空间频率上的对比敏感度,视力和在一个宽范围空间频率上的对比敏感度;(b)知觉训练并未引起任何显著的屈光变化;(c)改善的机理是内部加性噪声降低和外部噪声排除相结合;以及(d)在3名测试的观察者中他们改善的视力和对比敏感度几乎可以完全维持至少四个月。这些结果表明,知觉学习可以提供一种潜在的无创化过程来弥补轻中度近视眼的光学缺陷。

Visual performance is jointly determined by the quality of optical transmission of the eye and neural processing in the visual system. An open question is: Can effects of optical defects be compensated by perceptual learning in neural processing? To address this question, we conducted a perceptual learning study on 23 observers with myopic vision, targeting high frequency deficits by training them in a monocular grating detection task in the non-dominant eye near their individual cutoff spatial frequencies. The contrast sensitivity function and visual acuity in both eyes (without optical correction) were assessed for all the observers in the training group before and after training, and for all the observers in the control group twice with a 10-day interval between the tests. In addition, the threshold versus external noise contrast function was measured for five observers in the training group before and after training. We found that (a) training significantly improved contrast sensitivity at the trained spatial frequency, visual acuity, and contrast sensitivity over a wide range of spatial frequencies in both eyes; (b) training did not lead to any significant refractive changes; (c) the mechanism of improvements was a combination of internal additive noise reduction and external noise exclusion; and (d) the improvements in visual acuity and contrast sensitivity were almost fully retained for at least four months in the three observers tested. These results suggest that perceptual learning may provide a potential noninvasive procedure to compensate for optical defects in mild to modest myopia.

点击下载

CopyRight 2016  兴齐100版权所有 京ICP证060955号
技术支持:示剑网络   http://100.sinqi.com/