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BMC Ophthalmology

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Open Access 01-12-2017 | Research article

Comparison of ocular higher-order aberrations after SMILE and Wavefront-guided Femtosecond LASIK for myopia

Authors: Xiaoqin Chen, Yan Wang, Jiamei Zhang, Shun-nan Yang, Xiaojing Li, Lin Zhang

Published in: BMC Ophthalmology | Issue 1/2017

Abstract

Background

To compare changes in higher-order aberrations (HOAs) following small incision lenticule extraction (SMILE) and wavefront-guided femtosecond laser-assisted in situ keratomileusis (WFG FS-LASIK), and to investigate correlations between preoperative spherical equivalence (SE) and components of HOAs affecting visual quality.

Methods

Sixty-five myopic eyes from 38 patients were enrolled in the study retrospectively, either having undergone SMILE or WFG FS-LASIK. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), refractive error, and individual Zernike coefficients of 3rd- to 6th-order HOAs were measured before and 3 months after the surgeries and were compared using the Mann-Whitney test or Student’s t-test. Additional generalized estimating equation analyses (GEE) were used to control for within-subject biases in individual Zernike coefficients between the right and left eyes of the same patients.

Results

There was no significant difference in UDVA or CDVA after WFG FS-LASIK (Mean ± SD: −0.02 ± 0.07 and −0.04 ± 0.22 respectively, in logMAR) and after SMILE (−0.01 ± 0.06 and −0.04 ± 0.04 respectively). However, greater vertical coma aberration was found after SMILE (p = 0.036). Preoperative SE was correlated to induced horizontal coma (r = −0.608, p = 0.001) in WFG FS-LASIK, and correlated to induced vertical coma (r = −0.459, p = 0.003) in SMILE.

Conclusions

Both SMILE and WFG FS-LASIK can achieve planned visual outcomes in correcting myopia and myopic astigmatism. However, higher vertical coma was shown in SMILE than WFG FS-LASIK which might be a potentially impact factor for patients’ vision under certain lighting conditions and needs further investigation.

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Title: Comparison of ocular higher-order aberrations after SMILE and Wavefront-guided Femtosecond LASIK for myopia
Authors: Xiaoqin Chen
Yan Wang
Jiamei Zhang
Shun-nan Yang
Xiaojing Li
Lin Zhang
Publication date: 01-12-2017
Publisher: BioMed Central
Published in: BMC Ophthalmology / Issue 1/2017
Electronic ISSN: 1471-2415
DOI: https://doi.org/10.1186/s12886-017-0431-5

At a glance: The STEP trials

Springer Medicine

Comparison of ocular higher-order aberrations after SMILE and Wavefront-guided Femtosecond LASIK for myopia

Abstract

Background

Methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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