Journal of Otolaryngology and Ophthalmology of Shandong University ›› 2022, Vol. 36 ›› Issue (2): 83-89.doi: 10.6040/j.issn.1673-3770.0.2021.365

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Changes of kappa angle and alpha angle before and after cataract surgery

HU Yingfeng1, JIA Yuye3, WANG Yan1, ZHANG Rong1, WANG Zheng1, YE Xiangyu1,2   

  1. 1. Department of Cataract, Fuzhou Eye Hospital, Fuzhou 350007, Fujian, China;
    2. Department of Ophthalmology, the Second Hospital of Fuzhou, Xiamen University, Fuzhou 350007, Fujian, China;
    3. Department of Ophthalmology, the Eighth People's Hospital of Qingdao, Qingdao 266100, Shandong, China
  • Published:2022-04-15

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Abstract: Objective To compare and analyze the changes of kappa angle and alpha angle in patients before and after cataract surgery. Methods 101 patients who underwent phacoemulsification in our hospital in 2020 were analyzed retrospectively. OPD scan Ⅲ was used to measure the size and direction of kappa angle(PDist、 MDist)and alpha angle(LDist)before and after the surgery. The pupil diameter of bright and dark environment were also measured by OPD scan Ⅲ. Preoperative biological parameters such as axial(AL), mean keratometry(Km), anterior chamber depth(ACD)and lens thickness(LT)were measured by OA-2000. The centroid kappa angle and centroid alpha angle before and after surgery were calculated. Paired sample t-test was used to analyze the difference of kappa angle and alpha angle before and after surgery. The correlation of preoperative kappa angle, postoperative kappa angle, preoperative alpha angle, postoperative alpha angle was analyzed by pearson correlations, and the correlation of pupil diameter, AL, Km, ACD, LT, DPDist, DMDist, DLDist was analyzed by pearson correlations. Results The preoperative PDist was(0.24±0.15)mm, the preoperative MDist was(0.27±0.14)mm, the preoperative LDist was(0.41±0.20)mm. The postoperative PDist was(0.21±0.14)mm, the postoperative MDist was(0.22±0.14)mm, the postoperative LDist was(0.41±0.22)mm. There was significant difference in PDist and MDist before and after surgery. PDist and MDist were decreased after surgery. There was no significant difference in LDist before and after surgery. There was no significant correlation between PDist and MDist before and after surgery. Postoperative LDist was positively correlated with preoperative LDist.DPDist was positively correlated with LT. DMDist was positively correlated with bright pupil diameter and dark pupil diameter. DLDist was positively correlated with age. Conclusion There was no significant change in the size and distribution of alpha angle before and after surgery,and was a positive correlation between preoperative and postoperative alpha angle. Compared with kappa angle, preoperative alpha angle evaluation is more reliable. However, patients with poor uncorrected visual acuity or abnormal pupil diameter before the surgery may cause large changes in kappa angle and alpha angle after surgery.

Key words: Kappa Angle, Alpha Angle, Vector analysis

CLC Number: 

  • R776
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