Eadie A S, Gray L S, Carlin P, Mon-Williams M
Department of Physical Sciences, Glasgow Caledonian University, UK.
Ophthalmic Physiol Opt. 2000 May;20(3):242-51.
Natural viewing conditions place equal demands on the vergence and accommodation systems. The two responses are co-ordinated via the interactive components which couple the two systems: accommodative vergence and vergence accommodation. The crosslink components are usually quantified by the AC/A and CA/C ratios. Whether these ratios are stable entities, genetically determined, or modifiable by experience has been the subject of some debate. A 'Virtual Reality' stimulus was used to place unequal demands on the vergence and accommodation systems. Pre-task and post-task measures of AC/A and CA/C were objectively determined. The changes in the post-task measures are discussed with reference to a dual interactive model of vergence and accommodation. Model simulations suggest that adaptation of the vergence and accommodative controllers (tonic adaptation) may also play a part by altering the open loop bias. The results therefore support the idea that vergence accommodation and accommodative vergence are capable of adaptation.
自然观看条件对双眼视轴辐辏和调节系统的要求是相同的。这两种反应通过将两个系统耦合在一起的交互成分进行协调：调节性辐辏和辐辏性调节。这些交联成分通常用AC/A和CA/C比率来量化。这些比率是稳定的、由基因决定的实体，还是可通过经验改变，一直是一些争论的主题。使用“虚拟现实”刺激对双眼视轴辐辏和调节系统施加不同的要求。客观地确定了任务前和任务后AC/A和CA/C的测量值。参照双眼视轴辐辏和调节的双重交互模型讨论了任务后测量值的变化。模型模拟表明，双眼视轴辐辏和调节控制器的适应（紧张性适应）也可能通过改变开环偏差发挥作用。因此，结果支持双眼视轴辐辏和调节能够适应这一观点。
