Home > Archive>Volume 17, Issue 3, 2024 >491-498. DOI:10.18240/ijo.2024.03.11
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Changes in posterior corneal elevation after small incision lenticule extraction for different myopic diopters
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Ai-Ping Song and Jian Zhuo. Department of Ophthalmology, the First Affiliated Hospital of Shandong First Medical University, Shandong Provincial Qianfoshan Hospital, 16766# Jingshi Road, Jinan 250014, Shandong Province, China. 13793164931@163.com; 1151385662@qq.com

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Supported by Shandong Provincial Natural Science Foundation (No.ZR2022QH384).

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    Abstract:

    AIM: To study the changes and effect factors of posterior corneal surface after small incision lenticule extraction (SMILE) with different myopic diopters. METHODS: Ninety eyes of 90 patients who underwent SMILE were included in this retrospective study. Patients were allocated into three groups based on the preoperative spherical equivalent (SE): low myopia (SE≥-3.00 D), moderate myopia (-3.00 D>SE>-6.00 D) and high myopia (SE≤-6.00 D). Posterior corneal surfaces were measured by a Scheimpflug camera preoperatively and different postoperative times (1wk, 1, 3, 6mo, and 1y). Posterior mean elevation (PME) at 25 predetermined points of 3 concentric circles (2-, 4-, and 6-mm diameter) above the best fit sphere was analyzed. RESULTS: All surgeries were completed uneventfully and no ectasia was found through the observation. The difference of myopia group was significant at the 2-mm ring at 1 and 3mo postoperatively (1mo: P=0.017; 3mo: P=0.018). The effect of time on ΔPME was statistically significant (2-mm ring: P=0.001; 4-mm ring: P<0.001; 6-mm ring: P<0.001). The effect of different corneal locations on ΔPME was significant except 1wk postoperatively (1mo: P=0.000; 3mo: P=0.000; 6mo: P=0.001; 1y: P=0.001). Posterior corneal stability was linearly correlated with SE, central corneal thickness, ablation depth, residual bed thickness, percent ablation depth and percent stromal bed thickness. CONCLUSION: The posterior corneal surface changes dynamically after SMILE. No protrusion is observed on the posterior corneal surface in patients with different degrees of myopia within one year after surgery. SMILE has good stability, accuracy, safety and predictability.

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Xiao-Tong Sun, Yang Zhang, Xiao-Kun Mei,/et al.Changes in posterior corneal elevation after small incision lenticule extraction for different myopic diopters. Int J Ophthalmol, 2024,17(3):491-498

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Publication History
  • Received:July 24,2023
  • Revised:November 28,2023
  • Online: February 27,2024
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