Topographic and surgical risk factors for high postoperative residual astigmatism after small incision lenticule extraction in patients with different degrees of myopia: a retrospective cohort study

To evaluate the possible topographic and surgical risk factors for high postoperative residual astigmatism in patients who undergo small-incision lenticule extraction (SMILE) surgery and have different myopia degrees. A retrospective cohort study was conducted, and patients who underwent SMILE surge...

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Bibliographic Details
Published in:BMC ophthalmology 2024-01, Vol.24 (1), p.45-9, Article 45
Main Authors: Lee, Chia-Yi, Shen, Jen-Hsiang, Chao, Chen-Cheng, Lian, Ie-Bin, Huang, Jing-Yang, Yang, Shun-Fa, Chang, Chao-Kai
Format: Article
Language:English
Subjects:
Acuity
Astigmatism
Astigmatism - etiology
Astigmatism - surgery
Cohort analysis
Cornea
Cornea - surgery
Corneal curvature
Corneal Stroma - surgery
Corneal Surgery, Laser
Corneal Topography
Eye surgery
Humans
Lasers
Lasers, Excimer - therapeutic use
Medical research
Medicine, Experimental
Microsurgery
Mydriatics
Myopia
Myopia - surgery
Optics
Refraction, Ocular
Regression analysis
Retrospective Studies
Risk factors
Small incision lenticule extraction
Surgeons
Surgery
Surveys
Topography
Visual acuity
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Summary:To evaluate the possible topographic and surgical risk factors for high postoperative residual astigmatism in patients who undergo small-incision lenticule extraction (SMILE) surgery and have different myopia degrees. A retrospective cohort study was conducted, and patients who underwent SMILE surgery were enrolled. A total of 80 and 150 eyes from 40 to 75 individuals, respectively, were selected as the low myopia and high myopia groups. The demographic data, visual acuity, refraction, topographic parameters and surgical settings were recorded. Multiple linear regression with interaction tests were performed to survey the risk factors for high postoperative residual astigmatism in each group. Five (6.25%) and 9 (6.00%) eyes presented with high postoperative residual astigmatism in the low myopia and high myopia groups, respectively, but these differences were not significant (P = 0.569). A steep corneal curvature was correlated with a greater risk of high postoperative residual astigmatism in the low myopia group (P = 0.015), while a higher degree of cycloplegic cylinder power, steeper corneal curvature, greater topographic cylinder power, smaller optic zone and longer incision length were associated with a high rate of postoperative residual astigmatism in the high myopia group (all P 
ISSN:1471-2415
1471-2415
DOI:10.1186/s12886-024-03296-x