Yan Pisong, Du Zhiyu, Zhang Yu
Medal Eye Institute, Chongqing, China.
Department of Ophthalmology, Second Affiliated Hospital, Chongqing Medical University, Chongqing, China.
J Ophthalmol. 2017;2017:5647615. doi: 10.1155/2017/5647615. Epub 2017 Aug 2.
To evaluate the astigmatic outcomes of wavefront-guided sub-Bowman keratomileusis (WFG-SBK) for low to moderate myopic astigmatism.
This study enrolled 100 right eyes from 100 patients who underwent WFG-SBK for the correction of myopia and astigmatism. The polar value method was performed with anterior and posterior corneal astigmatism measured with Scheimpflug camera combined with Placido corneal topography (Sirius, CSO) and refractive astigmatism preoperatively and 1 month, 3 months, and 6 months postoperatively.
Similar results for surgically induced astigmatism (SIA) and error of the procedure in both anterior corneal astigmatism (ACA) and total ocular astigmatism (TOA). There was a minor undercorrection of the cylinder in both ACA and TOA. Posterior corneal astigmatism (PCA) showed no significant change.
Wavefront-guided SBK could provide good astigmatic outcomes for the correction of low to moderate myopic astigmatism. The surgical effects were largely attributed to the astigmatic correction of the anterior corneal surface. Posterior corneal astigmatism remained unchanged even after WFG-SBK for myopic astigmatism. Polar value analysis can be used to guide adjustments to the treatment cylinder alongside a nomogram designed to optimize postoperative astigmatic outcomes in myopic WFG-SBK.
评估波前引导的准分子激光上皮瓣下角膜磨镶术（WFG-SBK）治疗低度至中度近视散光的散光矫正效果。
本研究纳入了100例接受WFG-SBK矫正近视和散光的患者的100只右眼。采用Scheimpflug相机联合Placido角膜地形图仪（Sirius，CSO）测量术前、术后1个月、3个月和6个月的角膜前表面和后表面散光以及屈光性散光，采用极坐标值法进行分析。
手术诱导散光（SIA）以及角膜前表面散光（ACA）和全眼散光（TOA）的手术误差结果相似。ACA和TOA中柱镜均有轻度欠矫。角膜后表面散光（PCA）无显著变化。
波前引导的SBK在矫正低度至中度近视散光方面可提供良好的散光矫正效果。手术效果主要归因于角膜前表面的散光矫正。即使在接受WFG-SBK治疗近视散光后，角膜后表面散光仍保持不变。极坐标值分析可用于指导调整治疗柱镜，同时结合旨在优化近视WFG-SBK术后散光矫正效果的列线图。
