The effect of lateral tarsal strip surgery on corneal biomechanical parameters measured by Corvis ST

Q3 Physics and Astronomy

Results in Optics Pub Date : 2024-10-11 DOI:10.1016/j.rio.2024.100751

Alaa Mohammad Alghurab , Ali H. Alnasraw , Maythum Ali Shallan , Rawaa Awad Kadhum , Heba G. Abdelzaher , M.A. Abdelzaher

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Abstract

Purpose

To evaluate the effect of lateral tarsal strip (LTS) surgery for involutional ectropion on corneal biomechanical properties measured by the Corvis ST device.

Methods

This prospective clinical study examined 23 patients (mean age 67.7 years) undergoing LTS for involutional ectropion. Corneal biomechanics were evaluated preoperatively and at 1 month postoperatively using the Corvis ST. Deformation amplitude, applanation length, highest concavity measurements, and corneal biomechanical indices were compared before and after LTS.

Results

The second applanation deformation amplitude was significantly reduced after LTS compared to before (0.471 vs 0.428 mm, p = 0.031) indicating improved corneal stiffness. First applanation deflection length also decreased significantly following surgery (2.342 vs 1.967 mm, p = 0.043) suggesting enhanced corneal stability. Highest concavity deformation parameters were unchanged. Corneal biomechanical index, stiffness parameter, and intraocular pressure compensatory effect showed no significant differences pre- versus post-operatively.

Conclusions

LTS surgery leads to measurable improvements in select corneal biomechanical parameters, specifically applanation deformation amplitude and deflection length. This preliminary analysis reveals subtle beneficial impacts on corneal stiffness and stability after surgical correction of ectropion. LTS appears to marginally augment corneal biomechanical properties based on Corvis ST assessment.

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侧跗条手术对 Corvis ST 测量的角膜生物力学参数的影响

目的评估侧跗条（LTS）手术治疗内卷外翻对 Corvis ST 设备测量的角膜生物力学特性的影响。方法这项前瞻性临床研究对 23 名接受侧跗条手术治疗内卷外翻的患者（平均年龄 67.7 岁）进行了检查。使用 Corvis ST 对术前和术后 1 个月的角膜生物力学进行了评估。结果角膜塑形镜术后第二次角膜塑形的变形幅度比术前明显降低（0.471 vs 0.428 mm，p = 0.031），这表明角膜硬度有所提高。手术后首次角膜屈光变形长度也明显减少（2.342 vs 1.967 mm，p = 0.043），这表明角膜稳定性增强。最高凹变形参数保持不变。角膜生物力学指数、硬度参数和眼压补偿效应在术前和术后无显著差异。结论角膜塑形镜手术可显著改善部分角膜生物力学参数，特别是角膜屈光变形幅度和变形长度。这项初步分析显示了手术矫正外翻后对角膜硬度和稳定性的微妙有益影响。根据 Corvis ST 评估结果，LTS 似乎能略微增强角膜的生物力学特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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