Hynes Niall J, Cufflin Matthew P, Hampson Karen M, Mallen Edward A H
School of Optometry & Vision Science, University of Bradford, Bradford BD7 1DP, UK.
Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK.
Vision (Basel). 2018 Sep 6;2(3):36. doi: 10.3390/vision2030036.
Previous studies have shown cognition to have an influence on accommodation. Temporal variation in the accommodative response occurs during the fixation on a stationary target. This constantly shifting response has been called accommodative micro-fluctuations (AMFs). The aim of this study is to determine the effects of increasing task cognitive demand on the ocular accommodation response. AMFs for 12 myopes and 12 emmetropes were measured under three conditions of varying cognitive demand and comprising reading of numbers (Num), simple arithmetic (SA), and complex arithmetic (CA). Fast Fourier transforms were used to analyze the different frequency band components of the AMFs. Other aspects of AMFs including root mean square accommodation values and chaos analysis was applied. A repeated measures ANOVA revealed a significant main effect of cognition in the mean power of the high frequency component (HFC) (F = 10.03, < 0.005). Pairwise analyses revealed that these differences exist between SA and CA tasks ( < 0.005) and the Num and CA ( < 0.005) tasks with the HFC power being the highest for the CA condition. It appears that the difficulty of a task does affect active accommodation but to a lesser extent than other factors affecting accommodation.
先前的研究表明认知对调节有影响。在注视静止目标期间，调节反应会出现时间变化。这种持续变化的反应被称为调节微波动（AMFs）。本研究的目的是确定增加任务认知需求对眼调节反应的影响。在三种不同认知需求条件下，对12名近视者和12名正视者的AMFs进行了测量，这三种条件包括数字阅读（Num）、简单算术（SA）和复杂算术（CA）。使用快速傅里叶变换分析AMFs的不同频段成分。还应用了AMFs的其他方面，包括均方根调节值和混沌分析。重复测量方差分析显示，认知对高频成分（HFC）的平均功率有显著的主效应（F = 10.03，< 0.005）。两两分析显示，SA与CA任务之间（< 0.005）以及Num与CA任务之间（< 0.005）存在这些差异，CA条件下HFC功率最高。似乎任务难度确实会影响主动调节，但程度小于影响调节的其他因素。
