Distribution of angle α and angle κ in a population with cataract in Shanghai. Issue 5 (May 2021)

• Record Type: Journal Article
• Authors: Meng, Jiaqi; Du, Yu; Wei, Ling; Yao, Yunqian; He, Wenwen; Qian, Dongjin; Lu, Yi; Zhu, Xiangjia
• Is Part Of: Journal of cataract and refractive surgery. Volume 47:Issue 5(2021)
• Page Start: 579
• Page End: 584
• Publication Date: 2021-05
• Subjects: 617.7
• DOI: 10.1097/j.jcrs.0000000000000490
• Languages: English
• ISSNs: 0886-3350

Abstract

Abstract : Angle α and angle κ, mainly located temporal to the visual axis, change nonlinearly as axial length increased, and their locations gradually shifted to the nasal side. Abstract : Purpose: To describe the distribution of angle α and angle κ in a population with cataract in Shanghai. Setting: Eye and Ear, Nose, Throat Hospital, Fudan University, Shanghai, China. Design: Hospital-based, cross-sectional study. Methods: Angle α, angle κ, and other ocular biometric parameters were determined by IOLMaster 700. The distributions of angle α and angle κ and their associations with systemic and ocular parameters were assessed. Results: This study included 15 127 eyes of 15 127 cataract patients. The mean angle α and angle κ values were 0.45 ± 0.21 mm and 0.30 ± 0.18 mm, respectively. Angle α and angle κ were both predominantly located temporal to the visual axis. A greater angle α or angle κ was associated with older age, lower corneal power, shorter white-to-white distance, and shallower anterior chamber depth (all P < .05). Angle α correlated positively with angle κ. With increasing axial length (AL), angle α gradually decreased in a nonlinear way and shifted to the nasal side of the visual axis, whereas angle κ decreased in eyes with AL less than 27.5 mm but increased again in eyes with longer AL. Conclusions: Angle α and angle κ, both predominantly located temporal to the visual axis, were influenced by multiple anterior segment parameters. As AL increased, the changes in angle α and angle κ were nonlinear, and their locations gradually shifted from the temporal to the nasal side of the visual axis.