Alpha and Kappa angle on postoperative visual quality in cataract surgery.

IF 1.9 4区医学 Q2 OPHTHALMOLOGY

International journal of ophthalmology Pub Date : 2025-06-18 eCollection Date: 2025-01-01 DOI:10.18240/ijo.2025.06.08

Xiao-Na Chen, Ying-Yue Xiong, Jia Wei, Bin Luo, Ya-Li Gao

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引用次数: 0

Abstract

Aim: To explore the effect of Alpha angle and Kappa angle before multifocal intraocular lenses (MIOLs) implantation on postoperative visual quality of patients.

Methods: Before and 3mo after cataract surgery, Alpha angle and Kappa angle were collected using IOL Master 700, iTrace, and Pentacam for clinical observation. Postoperative visual quality indicators, including high-order aberrations (HOA), modulation transfer function (MTF) and point spread function (PSF), were collected using iTrace. multiple linear regression analysis was used to analyze the correlation of the Kappa angle and the Alpha angle with age, axial length (AL), anterior chamber depth (ACD), keratometry (K), lens thickness (LT) and corneal white to white distance (WTW). Pearson correlation coefficient was used to analyze the correlation between Alpha angle and Kappa angle; Bland Altman analysis was used to evaluate the consistency of pairwise detection results of three instruments.

Results: The Alpha angle was modeled as Alpha=2.230+0.003×age-0.036×AL-0.025×K-0.058×WTW and the Kappa angle was modeled as Kappa=0.685+ 0.003×age-0.013×K-0.061×WTW. The correlation between the total Alpha angle and Kappa angle of the three instruments was weakly positive (r=0.291, P=0.000). Comparing the measurement of Alpha angle and Kappa angle using three instruments, only IOL Master 700 and iTrace showed good consistency in measuring Kappa angle (P=0.4254). After 3mo of surgery, the Alpha angle and Kappa angle significantly decreased (P=0.011, 0.018; P=0.008, 0.036). △Kappa=1.136-0.021×AL-0.013×K. Kappa angle could positively predict HOA (β=0.18, P=0.000), MTF (β=0.171, P=0.000), PSF (β=0.088, P=0.000), Alpha angle cannot (P>0.05).

Conclusion: The patients with older age, flatter K and shorter WTW should be alert to the possibility of larger Alpha angle and Kappa angle. Alpha angle should also consider the factor of AL. When selecting patients with MIOLs implantation, there is no need to consider the Alpha angle. Careful consideration should be given to the Kappa angle, and the preoperative standard of <0.5 mm can refer to △Kappa=1.136-0.021×AL-0.013×K and be appropriately relaxed.

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α角和Kappa角对白内障术后视觉质量的影响。

目的：探讨多焦人工晶状体植入术前α角和Kappa角对患者术后视觉质量的影响。方法：采用IOL Master 700、iTrace和Pentacam分别于白内障手术前和术后3mo采集α角和Kappa角进行临床观察。采用iTrace采集术后视觉质量指标，包括高阶像差（HOA）、调制传递函数（MTF）和点扩散函数（PSF）。采用多元线性回归分析Kappa角和Alpha角与年龄、眼轴长（AL）、前房深度（ACD）、角膜度数(K)、晶状体厚度（LT）和角膜白距（WTW）的相关性。采用Pearson相关系数分析Alpha角与Kappa角的相关性；采用Bland Altman分析评价三种仪器两两检测结果的一致性。结果：Alpha角模型为Alpha=2.230+0.003×age-0.036×AL-0.025×K-0.058×WTW， Kappa角模型为Kappa=0.685+ 0.003×age-0.013×K-0.061×WTW。三种仪器的总Alpha角与Kappa角呈弱正相关（r=0.291， P=0.000）。比较三种仪器测量Alpha角和Kappa角，只有IOL Master 700和iTrace测量Kappa角的一致性较好（P=0.4254）。术后3mo， Alpha角、Kappa角明显降低(P=0.011、0.018；P = 0.008, 0.036)。△K = 1.136×-0.021×al - 0.013 K。Kappa角能预测HOA （β=0.18， P=0.000）、MTF （β=0.171， P=0.000）、PSF (β=0.088， P=0.000)， α角不能预测HOA （P = 0.05）。结论：年龄较大、K较平、WTW较短的患者应警惕Alpha角和Kappa角较大的可能性。α角还应考虑人工晶状体的因素，在选择人工晶状体植入术患者时，无需考虑α角。应仔细考虑Kappa角，术前标准为

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来源期刊

International journal of ophthalmology Medicine-Ophthalmology

CiteScore

2.50

自引率

7.10%

发文量

3141

审稿时长

4-8 weeks

期刊介绍： · International Journal of Ophthalmology-IJO (English edition) is a global ophthalmological scientific publication and a peer-reviewed open access periodical (ISSN 2222-3959 print, ISSN 2227-4898 online). This journal is sponsored by Chinese Medical Association Xi’an Branch and obtains guidance and support from WHO and ICO (International Council of Ophthalmology). It has been indexed in SCIE, PubMed, PubMed-Central, Chemical Abstracts, Scopus, EMBASE , and DOAJ. IJO JCR IF in 2017 is 1.166. IJO was established in 2008, with editorial office in Xi’an, China. It is a monthly publication. General Scientific Advisors include Prof. Hugh Taylor (President of ICO); Prof.Bruce Spivey (Immediate Past President of ICO); Prof.Mark Tso (Ex-Vice President of ICO) and Prof.Daiming Fan (Academician and Vice President, Chinese Academy of Engineering. International Scientific Advisors include Prof. Serge Resnikoff (WHO Senior Speciatist for Prevention of blindness), Prof. Chi-Chao Chan (National Eye Institute, USA) and Prof. Richard L Abbott (Ex-President of AAO/PAAO) et al. Honorary Editors-in-Chief: Prof. Li-Xin Xie(Academician of Chinese Academy of Engineering/Honorary President of Chinese Ophthalmological Society); Prof. Dennis Lam (President of APAO) and Prof. Xiao-Xin Li (Ex-President of Chinese Ophthalmological Society). Chief Editor: Prof. Xiu-Wen Hu (President of IJO Press). Editors-in-Chief: Prof. Yan-Nian Hui (Ex-Director, Eye Institute of Chinese PLA) and Prof. George Chiou (Founding chief editor of Journal of Ocular Pharmacology & Therapeutics). Associate Editors-in-Chief include: Prof. Ning-Li Wang (President Elect of APAO); Prof. Ke Yao (President of Chinese Ophthalmological Society) ; Prof.William Smiddy (Bascom Palmer Eye instituteUSA) ; Prof.Joel Schuman (President of Association of University Professors of Ophthalmology,USA); Prof.Yizhi Liu (Vice President of Chinese Ophtlalmology Society); Prof.Yu-Sheng Wang (Director of Eye Institute of Chinese PLA); Prof.Ling-Yun Cheng (Director of Ocular Pharmacology, Shiley Eye Center, USA). IJO accepts contributions in English from all over the world. It includes mainly original articles and review articles, both basic and clinical papers. Instruction is Welcome Contribution is Welcome Citation is Welcome Cooperation organization International Council of Ophthalmology(ICO), PubMed, PMC, American Academy of Ophthalmology, Asia-Pacific, Thomson Reuters, The Charlesworth Group, Crossref,Scopus,Publons, DOAJ etc.