Comparison of Four Intraocular Power Calculation Formulas in Keratoconus Eyes

Introduction: This study aimed to evaluate the differences in Intraocular Lens (IOL) power keratoconus (KC) eyes between calculations obtained clinically with most commonly used formulas healthy (SRK T, Holladay 1, Hoffer Q and Haigis) as well define predictive factors for such differences. Methods: retrospective comprised 43 of 22 patients no previous ocular surgery. IOL powers were calculated SRK Q, Haigis formulas, considering Effective Position (ELP) each formula desired refraction 0 D (R des =0 D). Results: All statistically significant relevant. always provided higher values compared rest highest observed when comparing (0.84 D) (1.17 formulas. The lowest difference was comparison SRK-T 1 (0.22 Differences magnitude decreased, becoming patient more myopic. Increased deep anterior chambers, steeper posterior corneal surfaces, high axial lengths. Conclusion: comparable results are by T whereas provides discrepant outcome. consideration curvature second surface may decrease variability calculation methods. However, other chamber depth or length also