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已发表论文
将散光型人工晶状体轴位与角膜陡峭子午线对齐并将SIA设为0屈光度：一项前瞻性随机对照试验
Authors Song F , Xie J, Peng Y, Li H , Dai Y
Received 9 September 2025
Accepted for publication 17 January 2026
Published 29 January 2026 Volume 2026:20 566499
DOI https://doi.org/10.2147/OPTH.S566499
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 4
Editor who approved publication: Dr Bharat Gurnani
Fanqian Song, Jin Xie, Yusu Peng, Honglei Li, Yunhai Dai
Eye Institute of Shandong First Medical University, Qingdao Eye Hospital of Shandong First Medical University, Qingdao, People’s Republic of China
Correspondence: Yunhai Dai, Eye Institute of Shandong First Medical University, Qingdao Eye Hospital of Shandong First Medical University, No. 5 Yan’erdao Road, Shinan District, Qingdao, Shandong, 266071, People’s Republic of China, Email yunhaidai@163.com
Purpose: This study aims to investigate the clinical efficacy of aligning the axis of toric intraocular lens (IOL) with the corneal steep meridian in cataract patients.
Methods: This is a prospective randomized controlled trial involving seventy cataract patients who underwent implantation of a Tecnis Toric IOL. Patients were randomly divided into two groups. In the control group, the incision-induced surgically induced astigmatism (SIA) was set at 0.5 D, and the alignment axis was determined using the Tecnis Toric Aspheric IOL Calculator. In the experimental group, incision SIA was set as 0 D and the alignment axis was aligned with the steep meridian of corneal astigmatism. Primary outcome measures, including astigmatism vector analysis, incision SIA and error of refractive astigmatism (ERA) were analyzed. Visual acuity, predicted residual astigmatism (PRA) and residual astigmatism were evaluated at 3 months.
Results: Measurements of postoperative uncorrected and corrected distance visual acuity (UDVA and CDVA), degrees of lens dislocation (°), incision-induced SIA, target induced astigmatism vector and actual surgically induced astigmatism showed no differences between the two groups (P > 0.05). The ERA of the experimental group (0.15 ± 0.32 D) was significantly smaller than the control group (0.58 ± 0.48 D) (P < 0.001). Vector analysis of total error vector (EV) was smaller in the experimental group (0.30 ± 0.24 D) than the control group (0.60 ± 046 D) (P = 0.001). The experimental group showed lower postoperative cylinder (0.49 ± 0.23 D) than the control group (0.71 ± 0.49 D) (P = 0.055).
Conclusion: This study suggests that aligning the toric IOL axis with the corneal steep meridian showed by setting SIA as 0 D might be an available method to reduce the error of refractive astigmatism.
Keywords: toric intraocular lens, corneal steep axis, astigmatism correction, cataract surgery
Eye Institute of Shandong First Medical University, Qingdao Eye Hospital of Shandong First Medical University, Qingdao, People’s Republic of China
Correspondence: Yunhai Dai, Eye Institute of Shandong First Medical University, Qingdao Eye Hospital of Shandong First Medical University, No. 5 Yan’erdao Road, Shinan District, Qingdao, Shandong, 266071, People’s Republic of China, Email yunhaidai@163.com
Purpose: This study aims to investigate the clinical efficacy of aligning the axis of toric intraocular lens (IOL) with the corneal steep meridian in cataract patients.
Methods: This is a prospective randomized controlled trial involving seventy cataract patients who underwent implantation of a Tecnis Toric IOL. Patients were randomly divided into two groups. In the control group, the incision-induced surgically induced astigmatism (SIA) was set at 0.5 D, and the alignment axis was determined using the Tecnis Toric Aspheric IOL Calculator. In the experimental group, incision SIA was set as 0 D and the alignment axis was aligned with the steep meridian of corneal astigmatism. Primary outcome measures, including astigmatism vector analysis, incision SIA and error of refractive astigmatism (ERA) were analyzed. Visual acuity, predicted residual astigmatism (PRA) and residual astigmatism were evaluated at 3 months.
Results: Measurements of postoperative uncorrected and corrected distance visual acuity (UDVA and CDVA), degrees of lens dislocation (°), incision-induced SIA, target induced astigmatism vector and actual surgically induced astigmatism showed no differences between the two groups (P > 0.05). The ERA of the experimental group (0.15 ± 0.32 D) was significantly smaller than the control group (0.58 ± 0.48 D) (P < 0.001). Vector analysis of total error vector (EV) was smaller in the experimental group (0.30 ± 0.24 D) than the control group (0.60 ± 046 D) (P = 0.001). The experimental group showed lower postoperative cylinder (0.49 ± 0.23 D) than the control group (0.71 ± 0.49 D) (P = 0.055).
Conclusion: This study suggests that aligning the toric IOL axis with the corneal steep meridian showed by setting SIA as 0 D might be an available method to reduce the error of refractive astigmatism.
Keywords: toric intraocular lens, corneal steep axis, astigmatism correction, cataract surgery