Comparison of Biometric Formulae for Intra Ocular Lens Power Calculation

Doi: 10.36351/pjo.v40i1.1692


  • Mariam Ghaffar Duhs/Chk
  • Muhammad Muneer Quraishy
  • Muhammad Adnan Shaikh
  • Mehvash Hussain
  • Zaheer Sultan



Purpose:  To determine the accuracy of different biometric formulae for intraocular lens power (IOL) calculation in predicting a target postoperative refraction within ± 1.0 diopters in patients with long axial length undergoing phacoemulsification.

Study Design:  Cross sectional study.

Place and Duration of Study:  Department of Ophthalmology and visual sciences, Unit 1 Dow University of Health Sciences, Dr. Ruth KM Phau Civil Hospital Karachi from February 2019 to August 2019.

Methods:  The study included 45 eyes with cataract and preoperative uncorrected visual acuity ranging from 6/60-6/12, axial length of 24.5 to 27.0 mm with no other ocular problem. IOL power was calculated with SRK-T, Holladay 1 and Haigis formula installed in optical biometer AL-Scan (Nidek Co, Ltd., Gamagori, Japan) and by Barrett universal 2 formula from Patients underwent phacoemulsification by single surgeon. Follow up included refractive status using Autorefractokertometer, URK-700 (Unicos Co., Ltd., Korea) at 6th week post-operatively. Deviation of actual postoperative refraction from the predicted target preoperative refraction were calculated and values within ± 1.0 diopter were considered accurate. Data was analyzed using SPSS version 22.

Results:  Outcome in terms of postoperative refractive error (+1D to -1D) with respect to biometric formula showed 100% accuracy using Haigis formula, 90% accuracy using SRK-T formula, 72.72% accuracy using Barrett universal II formula and 66.67% accuracy using Holladay-1 formula.

Conclusion:  Haigis formula proved to be more reliable and accurate than SRK-T, Holladay 1 and Barrett universal II formulae for calculation of intraocular lens power in eyes with long axial length.




How to Cite

Ghaffar M, Muneer Quraishy M, Adnan Shaikh M, Hussain M, Sultan Z. Comparison of Biometric Formulae for Intra Ocular Lens Power Calculation: Doi: 10.36351/pjo.v40i1.1692. pak J Ophthalmol [Internet]. 2023 Dec. 4 [cited 2024 Mar. 5];40(1). Available from:



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