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All Journal Ophthalmologica Indonesiana
Fatimah Dyah Nur Astuti
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Health Professions Medicine & Pharmacology Public Health

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THE DIFFERENCE OF PREDICTED AND FINAL REFRACTION USING BU-II AND SRK/T FORMULA IN HIGH MYOPIA PATIENT AT DR. KARIADI HOSPITAL Irlinda, Riva; Fatimah Dyah Nur Astuti; A. Kentar Arimadyo Sulakso; Wisnu Sadasih; A. Rizal Fanany
Majalah Oftalmologi Indonesia Vol 49 No S1 (2023): Supplement Edition
Publisher : The Indonesian Ophthalmologists Association (IOA, Perhimpunan Dokter Spesialis Mata Indonesia (Perdami))

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35749/hx0ct185

Abstract

Introduction: Studies showed 38% refractive errors after intraocular lens (IOL) implantation are caused by deviations in calculation of IOL power. The difference between the formula’s refractive prediction and patient’s final outcome highly increases in cases of high myopia, but needs to be more research on this topic. This study aims to show difference between predicted and final refractive outcomes using Barrett II Universal (BU-II) and SRK/T in patients with high myopia who underwent phacoemulsification and IOL implantation. Method: This analytical observational study with cross-sectional design was conducted on high myopia patients (axial length ? 26.0 mm) who underwent phacoemulsification and intraocular lens implantation between January 2021 and January 2022 at Dr. Kariadi General Hospital Semarang. Data used in this study consisted of biometric measurements and difference between predicted refractive outcomes using BU-II and SRK/T formulas and final refractive outcomes of patients one month after surgery. Data were analyzed using one-sample T-test, and significance level of p < 0.05 was considered statistically significant. Results: Thirty-five eyes participated in this study, the mean axial length was (29.33  2.01). BU-II formula has mean difference in refraction prediction with patient's final refraction result closer to zero (1.191.31) than SRK/T formula (1.25  1,12). The difference between two formulas was statistically significant (p < 0.05). Conclusion: The BU-II formula has lower difference between predicted and final refractive outcomes of high myopia patients after phacoemulsification and IOL implantation than SRK/T formula.
Comparing Predictability of SRK/T, Barrett Universal II, and Kane Formulas on High Myopia Phacoemulsification Ryamizard, Rizal; Wisnu Sadasih; A. Rizal Fanany; Fatimah Dyah Nur Astuti
Majalah Oftalmologi Indonesia Vol 52 No 1 (2026): Ophthalmologica Indonesiana
Publisher : The Indonesian Ophthalmologists Association (IOA, Perhimpunan Dokter Spesialis Mata Indonesia (Perdami))

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35749/oi.v52i1.102089

Abstract

Introduction: The refractive outcomes of phacoemulsification surgery have improved significantly in recent years, but it is still challenging to obtain good outcomes in eyes with long axial lengths. This study compares the difference between the predicted and manifest refraction outcomes between Sanders Retzlaff Kraff theoretical (SRK/T), Barrett Universal II (BU-II), and Kane formula in high myopia patients undergoing uncomplicated phacoemulsification surgery. Methods: This cross-sectional design study includes eyes with high myopia (axial length ≥26.0 mm) that undergo uncomplicated phacoemulsification surgery with intraocular lens implantation between January 2024 and January 2025 at Semarang Tertiary Hospital. The one-month post-surgery mean absolute prediction errors (MAE) difference between SRK/T, BU-II, and Kane formula are calculated and analyzed using the Wilcoxon Sign Rank Test. Result: Thirty-seven eyes meeting the criteria were analyzed, with a mean axial length of 29.07±2.42 mm. The MAE and percentages of eyes within 0.50 diopters (D) refractive prediction errors of the three formulas are as follows: SRK/T (0.68 D, 60%), BU-II (0.41 D, 73%), and Kane (0.37 D, 76%). There is a statistically significant difference in MAE between SRK/T vs BU-II (p < 0.05) and SRK/T vs Kane (p < 0.05). Conclusion: The Kane and BU-II formula has better accuracy in predicting refractive outcome (lower MAE and higher percentages of eyes within 0.5 D refractive prediction errors) than the SRK/T formula in patients with high myopia who undergo uncomplicated phacoemulsification surgery.  
Co-Authors A. Kentar Arimadyo Sulakso A. Rizal Fanany Riva Irlinda Ryamizard, Rizal Wisnu Sadasih