Angle Kappa measurement pre-keratorefractive and post-keratorefractive surgery using Orbscan 3

R. Zaki, H. Gharieb, I. Othman
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Abstract

Aim of the study Measurement of the mean angle Kappa pre-keratorefractive and post-keratorefractive surgery utilizing Orbscan 3. Patients and methods This retrospective study was conducted on patients who had refractive surgeries, group A included patients who underwent Lasik and group B included patients who underwent Photo Refractive Keratectomy (PRK). Mean age from 18 to 45 years. Preoperative, 1-week, and 1-month postoperative assessments included detailed ocular examination, slit-scanning topography done by Orbscan 3, and total ocular aberrations by Zywave 3 were done. Results The study comprised 146 eyes of 75 individuals. Preoperative data demonstrated that angle Kappa mean in Lasik group (group A) was 2.38±1.54 at 147.05±96.94, in PRK group (group B) was 2.31±1.17 at 137.67±85.7. Paired mean differences of the two groups between preoperative data and 1-week postoperative show no statistically significant difference in central corneal thickness (CCT) nor angle Kappa values. Paired mean differences of the two groups between preoperative data and 1-month postoperative show no statistically significant difference regarding CCT nor angle Kappa values. Preoperative, 1-week postoperative, and 1-month postoperative correlation of angle Kappa to refractive error, spherical equivalent, average K-reading, CCT and axial length, showed that both groups had a positive correlation with axial length. Conclusion Keratorefractive surgeries do not affect angle Kappa or its intercept measurements.
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角Kappa测量角膜屈光术前和术后应用Orbscan 3
研究利用Orbscan 3测量角膜屈光术前和术后Kappa平均角的目的。患者和方法这项回顾性研究对接受屈光手术的患者进行,A组包括接受Lasik手术的患者,B组包括接受光折射角膜切除术(PRK)的患者。平均年龄18至45岁。术前、术后1周和1个月的评估包括详细的眼部检查、Orbscan 3进行的狭缝扫描地形图和Zywave 3进行的总眼像差。结果该研究包括75名个体的146只眼睛。术前数据显示,Lasik组(A组)147.05±96.94处的Kappa角平均值为2.38±1.54,PRK组(B组)137.67±85.7处的Kap帕角平均值是2.31±1.17。两组术前数据与术后1周数据的配对平均差异显示,中央角膜厚度(CCT)和角度Kappa值均无统计学显著差异。两组术前数据和术后1个月数据的配对平均差异在CCT和角度Kappa值方面没有统计学显著差异。术前、术后1周和术后1个月Kappa角与屈光不正、球当量、平均K读数、CCT和轴长的相关性表明,两组均与轴长呈正相关。结论角膜塑形手术不影响Kappa角或其截距测量。
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审稿时长
19 weeks
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