Clinical Ophthalmology (Aug 2021)

Astigmatism Management with Astigmatism-Correcting Intraocular Lens Using Two Toric Calculators – A Comparative Case Series

  • Huang YT,
  • Lin CJ,
  • Lai CT,
  • Hsia NY,
  • Tien PT,
  • Bair H,
  • Chen HS,
  • Chiang CC,
  • Lin JM,
  • Chen WL,
  • Wu WC,
  • Tsai YY

Journal volume & issue
Vol. Volume 15
pp. 3259 – 3266

Abstract

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Yu-Te Huang,1 Chun-Ju Lin,1– 3,* Chun-Ting Lai,1,* Ning-Yi Hsia,1 Peng-Tai Tien,1,4 Henry Bair,1,5 Huan-Sheng Chen,6 Chun-Chi Chiang,1,2 Jane-Ming Lin,1,3 Wen-Lu Chen,1,3 Wen-Chuan Wu,1 Yi-Yu Tsai1– 3 1Department of Ophthalmology, China Medical University Hospital, China Medical University, Taichung, Taiwan; 2School of Medicine, College of Medicine, China Medical University, Taichung, Taiwan; 3Department of Optometry, Asia University, Taichung, Taiwan; 4Graduate Institute of Clinical Medical Science, College of Medicine, China Medical University, Taichung, Taiwan; 5Stanford University School of Medicine, Stanford, CA, USA; 6An-Shin Dialysis Center, NephroCare Ltd., Fresenius Medical Care, Taichung, Taiwan*These authors contributed equally to this workCorrespondence: Chun-Ju Lin; Chun-Ting LaiDepartment of Ophthalmology, China Medical University Hospital, 2 Yuh-Der Road, Taichung City, 40447, TaiwanTel +886-4-22052121, ext. 1141Fax +886-4-22059265Email [email protected]; [email protected]: To compare refractive outcomes after phacoemulsification and toric IOL implantation using two different toric calculators for initial astigmatism assessment in a real-world setting.Methods: This was a retrospective, comparative, interventional case series. Patients over 30-year-old who underwent phacoemulsification and toric IOL implantation (AcrySof® Toric IOL) by the same surgeon between 2017 and 2018 were included. Eyes with irregular astigmatism, previous corneal refractive surgery, intraocular surgery, corneal pathology, macular pathology and pupil abnormalities were excluded. IOL toricity was determined by using a calculator provided by the AcrySof Toric calculator before 2018 and Barrett Toric Calculator after 2018. Patient demographics, corneal topography, vector and preoperative and postoperative refraction were collected and analyzed at three months postoperative.Results: Thirty-two eyes of 32 patients were included in the final analysis. 0.1D for surgically induced astigmatism was used. Group 1 included 14 eyes assessed with the original (AcrySof) toric IOL calculator, and group 2 included 18 eyes assessed with the Barrett toric IOL calculator. In group 1, postoperative astigmatism less than − 1.00D, − 0.75 D, and − 0.5D was achieved in 88.2%, 76.1% and 53.7% of eyes, respectively, while, in group 2, 89% eyes achieved postoperative residual astigmatism less than 0.5D and all eyes achieved postoperative residual astigmatism less than 0.75D. The proportion of patients with lower postoperative astigmatism was significantly higher in Group 2 (p< 0.05 by chi-square test), a pattern that still held when we divided patients into multiple groups. Vector analysis with the Alpins methods also supported better outcomes in the Barrett group (0.71 D vs 0.35 D).Conclusion: The Barrett Toric calculator resulted in better results in the prediction of residual astigmatism than original (AcrySof) toric calculators.Keywords: astigmatism, cataract surgery, toric intraocular lens, posterior corneal astigmatism

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