Purpose

Convergence plays a fundamental role in the performance of near visual tasks. We measured the effect of two levels of convergence on anterior scleral thickness and shape in emmetropes, low to moderate myopes and high myopes.

Methods

Forty-five healthy young adults aged between 18 and 35 years including 15 emmetropes, 15 low/moderate myopes, and 15 high myopes were recruited. Anterior segment optical coherence tomography and eye surface profilometry were used to evaluate the anterior scleral thickness (nasal only, n = 42) and shape (n = 40), before and during two visual tasks involving 9° and 18° convergence, in those participants with complete and reliable data.

Results

Convergence led to a thickening of the total anterior eye wall (5.9 ± 1.4 μm) and forward movement (10 ± 2 μm) of the nasal anterior scleral surface (both p < 0.001). Larger changes were found at 18° than at 9° convergence and in more peripheral nasal scleral regions. There was a significant association between total wall thickening and forward movement of the scleral surface. Refractive group was not a significant main effect, but there were significant interactions between refractive group and the thickness changes with convergence in different scleral regions.

Conclusion

During convergence, the biomechanical forces acting on the eye lead to nasal anterior scleral thickening and forward movement of the nasal scleral surface.

中文翻译：

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前巩膜厚度和形状随着模拟收敛水平的变化而变化

目的

融合在近视觉任务的执行中起着基本作用。我们测量了两个会聚程度对正视眼，低度至中度近视和高度近视眼的前巩膜厚度和形状的影响。

方法

招募了45名年龄在18至35岁之间的健康年轻人，包括15个正视眼，15个低/中度近视眼和15个高度近视眼。在参与者进行涉及9°和18°会聚的两个视觉任务之前和期间，使用前段光学相干断层扫描和眼表轮廓测定法评估前巩膜厚度（仅鼻，n = 42）和形状（n = 40）完整而可靠的数据。

结果

会聚导致前眼总壁增厚（5.9±1.4μm）和鼻前巩膜表面向前运动（10±2μm）（均p <0.001）。在18°会聚处比在9°会聚处和更多的周边鼻巩膜区域发现更大的变化。总壁增厚与巩膜表面向前运动之间存在显着关联。屈光度不是主要的主效应，但是在不同的巩膜区域，屈光度与厚度变化之间存在显着的相互作用。

结论

在会聚过程中，作用在眼睛上的生物力学力会导致鼻前巩膜增厚和鼻巩膜表面向前运动。