Contact Lens and Visual Optics Laboratory, Institute of Health & Biomedical Innovation, School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia.
Visual and Ophthalmic Optics Laboratory, Institute of Health & Biomedical Innovation, School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia.
Ophthalmic Physiol Opt. 2020 Jul;40(4):482-490. doi: 10.1111/opo.12697. Epub 2020 Jun 3.
The sclera plays an important role in the biomechanical stability of the eye. We aimed to examine if changes in the shape of the anterior sclera occur in response to accommodation and convergence.
Thirty-six healthy young adult participants aged between 18 and 30 years including 18 myopes (-0.5 to -4.0 D) and 18 emmetropes (+0.5 to -0.25 D) were recruited. Eye surface profilometry was used to evaluate the anterior eye surface shape before and during visual tasks involving accommodation (5.0 D demand), simulated convergence (9° demand) and their combination. The changes in the sagittal height and axial radius of curvature of the nasal (n = 25) and temporal (n = 31) corneal periphery and anterior sclera were analysed in those participants with complete and reliable data on these sides.
Significant changes were confined to the nasal anterior scleral surface. A significant forward movement of the surface accompanied accommodation (mean change: 5 ± 2 µm), convergence (19 ± 6 µm), and their combination (16 ± 6 µm). There was flattening with convergence (0.092 ± 0.044 mm) and with the combination of accommodation and convergence (0.201 ± 0.071 mm). The changes in response to accommodation and convergence increased peripherally. Changes were not significantly different between low to moderate myopes and emmetropes.
Accommodation and simulated convergence affect the nasal anterior scleral shape, with the greatest changes associated with convergence and being most evident in the more peripheral nasal scleral regions.
巩膜在眼球的生物力学稳定性中起着重要作用。我们旨在研究在调节和集合的作用下，前巩膜的形状是否会发生变化。
招募了 36 名年龄在 18 至 30 岁之间的健康年轻成年参与者，包括 18 名近视患者（-0.5 至-4.0 D）和 18 名正视者（+0.5 至-0.25 D）。使用眼前表面轮廓仪评估视觉任务前后的眼前表面形状，这些任务涉及调节（5.0 D 需求）、模拟集合（9°需求）及其组合。在这些参与者中，分析了完整且可靠的这些侧面数据的情况下，鼻侧（n=25）和颞侧（n=31）角膜周边和前巩膜的矢状高度和轴向曲率半径的变化。
仅在鼻侧前巩膜表面观察到显著变化。随着调节（平均变化：5 ± 2 µm）、集合（19 ± 6 µm）及其组合（16 ± 6 µm），表面出现向前移动。集合时（0.092 ± 0.044 mm）和调节与集合的组合时（0.201 ± 0.071 mm）会变平坦。随着调节和集合的变化，巩膜外周变化增加。近视患者和正视者之间的变化没有显著差异。
调节和模拟集合会影响鼻侧前巩膜的形状，最大的变化与集合有关，在更外围的鼻侧巩膜区域最为明显。
