نبذة مختصرة : Purpose: This study aimed to compare the predictability and accuracy of different formulas for calculating the power of Tecnis ZCB00 intraocular lenses (IOLs) in patients undergoing cataract surgery.Patients and Methods: A retrospective comparative analysis was conducted at Basir Eye Clinic, Tehran, Iran, involving 491 eyes of 491 patients who underwent cataract surgery with Tecnis ZCB00 IOL insertion. Biometry data were entered into calculators for SRK/T, Hill Radial Basis Activation Function-2 (Hill RBF- 2), Barrett Universal II, and Ladas Super Formula. Tecnis ZCB00 IOL was implanted for all patients with the power calculated by SRK/T formula. The mean refractive prediction error was compared between Hill RBF- 2, Barrett Universal II, and Ladas Super Formula. Results: The mean refractive prediction error when considering the IOL power calculations using the Ladas Super Formula, Hill RBF-2, and Barrett Universal II were 1.07 ± 1.11, 0.97 ± 0.82, 1.21 ± 1.04, respectively (P < 0.01). Also, there was a significant difference between the formulas when accessing patients with short axial length (worst results with Barrett Universal II, P < 0.01), medium axial length (best results with Hill RBF-2, P < 0.01) and long axial length (worst results with Barrett Universal II, P < 0.01).Conclusion: For TECNIS®ZCB00 IOLs, the calculation of IOL power yielded the highest mean refractive prediction error with the Barrett Universal II formula.
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