Computer simulation of visual outcomes of wavefront‐only corneal ablation
Computer simulation of visual outcomes of wavefront‐only corneal ablation
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DOI：
10.1016/j.jcrs.2005.12.073
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发表时间：
2006-03
影响因子：
2.8
通讯作者：
Fan Yi;R. Iskander;Ross Franklin;M. Collins
中科院分区：
文献类型：
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作者：
Fan Yi;R. Iskander;Ross Franklin;M. Collins
角膜切削算法，单独使用波前像差测量，而不需要角膜形状信息的有效性，预测的视觉结果，和局限性进行评估。设置接触透镜和视觉光学实验室，验光学院，昆士兰州科技大学，布里斯班，澳大利亚。方法角膜地形图和波前误差数据从22只眼睛的11个潜在的屈光手术候选人被使用。进行角膜切削的计算机模拟，并通过计算得到的波前均方根（RMS）值和视觉Strehl比来评估预测的术后视力结果。此外，还检查了消融对准误差的影响。最后，将仅波前角膜消融术的视力结果与年龄匹配的20名正视眼患者的视力结果进行了比较。在理想设置和消融对准误差的情况下，术后总波前RMS和高阶波前RMS均获得了显著改善。在潜在的屈光手术候选人的视觉斯特列尔比的预测改善是显着优于未经治疗的正视眼。经过额外的模拟偏心的瞳孔中心150 μm，结果稍差，但变化被认为是不显着相比，视网膜图像质量的正视眼。CONCLUSIONSWavefront-only角膜切削算法可能会导致显着更好的视觉效果比那些通常遇到的未经处理的正视眼，只要对准误差不大。所提出的方法可用作筛选工具，以预测患者的手术前的视力结果。
PURPOSETo evaluate the effectiveness, predicted visual outcome, and limitations of a corneal ablation algorithm that uses wavefront aberration measurement alone without the need for corneal shape information.SETTINGContact Lens and Visual Optical Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia.METHODSCorneal topography and wavefront error data from 22 eyes of 11 potential refractive surgery candidates were used. A computer simulation of the corneal ablation was performed, and the predicted postoperative visual outcome was assessed by calculating the resulting wavefront root-mean-square (RMS) values and visual Strehl ratios. Additionally, the effect of ablation alignment error was examined. Finally, the visual outcomes of the wavefront-only corneal ablations were compared to those in an age-matched group of 20 emmetropic patients.RESULTSSignificant improvement in total and higher-order wavefront RMS was achieved postoperatively in both an ideal setting and in the case of ablation alignment errors. The predicted improvement in visual Strehl ratio in the potential refractive surgery candidates was significantly better than that in the untreated emmetropes. After additional simulated decentration of the pupil center by 150 μm, the result was slightly worse, but the change was found to not be significant when compared to the retinal image quality of emmetropes.CONCLUSIONSWavefront-only corneal ablation algorithms could potentially lead to significantly better visual outcomes than those normally encountered in untreated emmetropes, provided that the alignment error is not large. The presented methodology may be used as a screening tool to predict patients' visual outcomes before the surgery.