Early visual quality outcomes after small-incision lenticule extraction surgery for correcting high myopic astigmatism

To evaluate early optical quality outcomes after small-incision lenticule extraction (SMILE) surgery for correcting high myopic astigmatism. This retrospective study enrolled 55 eyes from 37 patients who had preoperative myopic astigmatism of ≥2.00 diopters (D) who had been treated with SMILE surger...

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Published in:BMC ophthalmology 2021-01, Vol.21 (1), p.48-48, Article 48
Main Authors: Hou, Xiangtao, Du, Kaixuan, Wen, Dan, Hu, Shengfa, Hu, Tu, Li, Chenling, Tang, Yanhui, Wu, Xiaoying
Format: Article
Language:English
Subjects:
Astigmatism
Astigmatism - surgery
Comparative analysis
Corneal Stroma - surgery
Corneal Surgery, Laser
Humans
Lasers, Excimer - therapeutic use
Medical research
Medicine, Experimental
Refraction, Ocular
Retrospective Studies
Visual Acuity
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Summary:To evaluate early optical quality outcomes after small-incision lenticule extraction (SMILE) surgery for correcting high myopic astigmatism. This retrospective study enrolled 55 eyes from 37 patients who had preoperative myopic astigmatism of ≥2.00 diopters (D) who had been treated with SMILE surgery. Preoperatively, the mean cylinder was - 2.41 ± 0.54 D (range, - 2.00 D to - 4.50 D). The preoperative and postoperative visual outcomes, refraction, and higher-order aberration (HOA) at 1 and 3 months were compared. Refractive astigmatism changes were analyzed by the Alpins vector method. Three months after SMILE surgery, the average cylinder was - 0.14 ± 0.31 D, and the average astigmatism vector was - 0.09 D × 6.34°. The angle of error (AofE) was limited to within ±10°, and the magnitude of error was limited to within ±1.0 D in all patients. The correction index (CI) was 0.98 ± 0.07, the index of success (IOS) was 0.08 ± 0.13, and the flattening index (FI) was 0.97 ± 0.07. Significant positive correlations were found between IOS and |AofE| (P = 0.000); negative correlations were found between FI and |AofE| (P = 0.000). The postoperative total HOA, spherical aberration, vertical coma aberration, and trefoil 30° were increased significantly compared with preoperative measurements, and the increase in HOA was closely related to preoperative astigmatism (P 
ISSN:1471-2415
1471-2415
DOI:10.1186/s12886-021-01807-8