Liu Chunming, Drew Stefanie A, Borsting Eric, Escobar Amy, Stark Lawrence, Chase Christopher
Western University of Health Sciences, College of Optometry, Pomona, CA, United States.
Western University of Health Sciences, College of Optometry, Pomona, CA, United States; California State University Northridge, Northridge, CA, United States.
Vision Res. 2016 Dec;129:25-32. doi: 10.1016/j.visres.2016.08.010. Epub 2016 Nov 1.
The purpose of this study is to examine the potential relationship between tonic accommodation (TA), near work induced TA-adaptation and the steady state closed-loop accommodation response (AR). Forty-two graduate students participated in the study. Various aspects of their accommodation system were objectively measured using an open-field infrared auto-refractor (Grand Seiko WAM-5500). Tonic accommodation was assessed in a completely dark environment. The association between TA and closed-loop AR was assessed using linear regression correlations and t-test comparisons. Initial mean baseline TA was 1.84diopter (D) (SD±1.29D) with a wide distribution range (-0.43D to 5.14D). For monocular visual tasks, baseline TA was significantly correlated with the closed-loop AR. The slope of the best fit line indicated that closed-loop AR varied by approximately 0.3D for every 1D change in TA. This ratio was consistent across a variety of viewing distances and different near work tasks, including both static targets and continuous reading. Binocular reading conditions weakened the correlation between baseline TA and AR, although results remained statistically significant. The 10min near reading task with a 3D demand did not reveal significant near work induced TA-adaptation for either monocular or binocular conditions. Consistently, the TA-adaptation did not show any correlation with AR during reading. This study found a strong association between open-loop TA and closed-loop AR across a variety of viewing distances and different near work tasks. Difference between the correlations under monocular and binocular reading condition suggests a potential role for vergence compensation during binocular closed-loop AR.
本研究的目的是探讨张力性调节（TA）、近工作诱导的TA适应与稳态闭环调节反应（AR）之间的潜在关系。42名研究生参与了该研究。使用开放式红外自动验光仪（精工WAM-5500）客观测量了他们调节系统的各个方面。在完全黑暗的环境中评估张力性调节。使用线性回归相关性和t检验比较评估TA与闭环AR之间的关联。初始平均基线TA为1.84屈光度（D）（标准差±1.29D），分布范围较宽（-0.43D至5.14D）。对于单眼视觉任务，基线TA与闭环AR显著相关。最佳拟合线的斜率表明，TA每变化1D，闭环AR大约变化0.3D。这一比例在各种观察距离和不同的近工作任务中都是一致的，包括静态目标和连续阅读。双眼阅读条件削弱了基线TA与AR之间的相关性，尽管结果仍具有统计学意义。3D需求的10分钟近阅读任务在单眼或双眼条件下均未显示出显著的近工作诱导的TA适应。同样，在阅读过程中，TA适应与AR之间没有任何相关性。本研究发现，在各种观察距离和不同的近工作任务中，开环TA与闭环AR之间存在很强的关联。单眼和双眼阅读条件下相关性的差异表明，在双眼闭环AR过程中，聚散补偿可能发挥作用。
