Sarcouncil Journal of Medical Sciences

Abstract: Aim Investigating the predicted error of refraction among various IOL formulas in myopic eyes is the aim, along with possible contributing factors, including anterior chamber depth (ACD), axial length (AL), keratometry, along with implanted IOL power. Patients & Methods: A month's postoperative refractive outcome at Ibn Al-Haitham Teaching Hospital among May 2024 and June 2025 was compared among two different IOL formulas (SRK/T and Haigis) for patients having AL greater than or equivalent to 24.5 mm who had uneventful phacoemulsification surgeries. Biometry was performed using IOL Master. The mean numerical error (MNE), referred to as the variance in the postoperative spherical equivalents (SE) and the mean absolute error (MAE), which was the difference between the absolute postoperative SE along with the absolute projected SE, were calculated for each formula. Findings: The MNE for the SRK/T and Haigis equations was -0.29+0.73 & -0.36±0.75 (p=0.106), whereas the MAE is 0.62±0.47 as well as 0.63+0.63 (p=0.829), respectively. No statistically significant difference was found between the equations in MNE as well as MAE for eyes having postoperative (SE) within 0.5D and 1.0D (p>0.05). About fifty percent of eyes are within 0.5D, and roughly 80% of eyes are within ID of the target refraction using both formulas. For eyes with AL greater than 28.75 mm, the MAE for the SRK/T and Haigis equations was 0.96±0.57 and 1.03±1.03, respectively. MAE was significantly correlated for implantable IOL power. Conclusion: The postoperative refractive errors generated by the SRK/T and Haigis equations are nearly identical in myopic eyes. Careful IOLpower choice is recommended since eyes having longer AL or when using minus-power IOLs are more likely to experience hyperopic outcomes.