Journal of Otolaryngology and Ophthalmology of Shandong University ›› 2026, Vol. 40 ›› Issue (1): 47-53.doi: 10.6040/j.issn.1673-3770.0.2024.322

• Original Article • Previous Articles     Next Articles

Influence of Alpha angle of intraocular lens on visual quality after the implantation of extended depth-of-field intraocular lens

LIU Zhen1, ZHOU Weiwei1, LIU Hanjing1, ZHANG Yi1, ZHU Yuguang2, ZHU Yan2   

  1. 1. School of Clinical Medicine, Shandong Second Medical University, Weifang 261053, Shandong, China2. Eye Center, The Affiliated Hospital of Shandong Second Medical University, Weifang 261035, Shandong, China
  • Online:2026-01-20 Published:2026-02-13

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Abstract: Objective To study the effect of the IOL Alpha angle on visual quality following the implantation of the EDOF IOL(ZXR00). Methods A total of 50 cases(50 eyes)that underwent phacoemulsification combined with EDOF IOL implantation were included in the study. Preoperative and IOL Alpha angle assessments were conducted using the OPD Scan Ⅲ wavefront aberrometer. The study eyes were then categorized into three distinct groups based on the IOL Alpha angle values ascertained: Group A(19 eyes, 0 mm < Alpha angle ≤0.2 mm), Group B(19 eyes, 0.2 mm < Alpha angle≤0.4 mm), and Group C(12 eyes, Alpha angle >0.4 mm). UDVA was recorded three months postoperatively. The OPD Scan Ⅲ was employed to evaluate intraocular aberrations, including SR, total HOA, Coma and Trefoil. The assessment of photic phenomena were conducted utilising the Visual Functioning Index-14. Results The preoperative and IOL Alpha angle were no statistically significant difference(t=0.11, P=0.915). Pearson correlation analysis revealed a significant positive correlation between the preoperative and the IOL Alpha angle(r=0.983, P<0.001). The differences in UDVA, intraocular aberration, SR, total HOA, Coma and Trefoil values among the three groups were statistically significant(all P<0.05). Statistically significant differences in intraocular aberrations were observed in pairwise comparisons among groups(all P<0.05). A statistically significant difference in Trefoil values was found between Group A and Group C(P=0.030), as well as in total HOA values between these two groups(P=0.001). The results of the questionnaire survey indicated that the prevalence of glare/halos among patients in the three groups was 47.4%(9/19), 68.4%(13/19)and 100%(12/12), respectively, with these differences being statistically significant(χ2=9.365, P=0.009). Conclusion The IOL Alpha angle may reflect the decentration and actual position of the IOL within the eye. The IOL Alpha angle may affect the postoperative visual acuity and reflect the actual visual quality after surgery. Larger IOL Alpha angle will increase the incidence of postoperative glare/halos, which may affect the patient's quality of life.

Key words: Alpha angle, Cataract, OPD-Scan Ⅲ, Extended depth-of-field intraocular lens, Visual quality

CLC Number: 

  • R776.1
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