Visual Outcomes and Higher Order Aberrations Following LASIK on Eyes with Low Myopia and Astigmatism.

The Open Ophthalmology Journal Pub Date : 2018-05-31 eCollection Date: 2018-01-01 DOI:10.2174/1874364101812010084
Smita Agarwal, Erin Thornell, Chris Hodge, Gerard Sutton, Paul Hughes
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引用次数: 24

Abstract

Background: Laser-Assisted in situ Keratomileusis (LASIK) can induce corneal aberrations that can impact vision and patient satisfaction. Recent developments in laser technologies have helped minimise these aberrations.

Objective: To assess the quality of vision and change in Higher-Order Aberrations (HOAs) following wavefront-optimized LASIK in low-myopic astigmatic patients.

Methods: LASIK was performed on a total of 76 eyes in patients with myopia <4.0 D and cylinder <2.0 D using the WaveLight® EX500 excimer and FS200 femtosecond laser platform. Visual acuity, contrast sensitivity and HOAs were measured at 1 and 3 months postoperatively and compared to preoperative values. Subjective quality of vision was assessed pre- and postoperatively using a VF14 questionnaire.

Results: Mean postoperative Spherical Equivalent (SE) was -0.09 ± 0.26 µm with 95% of patients within ± 0.5 D of attempted SE. Postoperative uncorrected distance visual acuity was 20/20 or better for 96% of patients. Contrast sensitivity increased against horizontal and vertical gratings at all spatial frequencies except for vertical gratings at 18 cycles/degree. Spherical aberration and total HOA increased by 0.085 µm and 0.13 µm respectively. The mean VF14 score increased from 89.2 ± 16.7% to 99 ± 1.4% postoperatively.

Conclusion: LASIK performed using the WaveLight® EX500 excimer and WaveLight® FS200 laser platform provided improved contrast sensitivity and visual acuity with minimal introduction of HOAs, making it a suitable platform for low myopic astigmatic patients.

Abstract Image

Abstract Image

Abstract Image

低近视眼和散光LASIK术后的视力结果和高阶像差。
背景:激光辅助原位角膜磨圆术(LASIK)可引起角膜畸变,影响视力和患者满意度。激光技术的最新发展有助于将这些畸变降至最低。目的:评价低近视散光患者行波前优化LASIK术后的视力质量和高阶像差(HOAs)变化。方法:对76例近视患者行LASIK手术。结果:术后平均球当量(SE)为-0.09±0.26µm, 95%的患者在±0.5 D范围内。96%的患者术后未矫正距离视力为20/20或更好。除了垂直光栅在18个周期/度外,在所有空间频率下,水平光栅和垂直光栅的对比灵敏度都增加了。球差和总HOA分别增大0.085µm和0.13µm。术后VF14平均评分由89.2±16.7%上升至99±1.4%。结论:使用wavight®EX500准分子和wavight®FS200激光平台进行LASIK手术,在最小程度引入hoa的情况下,提高了对比灵敏度和视力,使其成为低近视散光患者的合适平台。
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