Dr.Sanket Bhatnagar, B16754
Purpose: Accuracy of SRK-T, Barrett, Hill-RBF and Ladas super-formula in predicting refractive outcomes after cataract surgery in extreme myopic eyes was compared. Methods: A retrospective case series of 30 eyes with AL > 30mm and Sensar (AR40) IOL implantation following uncomplicated phacoemulsification was done. Prediction error at 4 wks postop (PE) was used to determine the formula with least error .Results: Mean emmetropic IOL powers predicted by formulae namely SRK T, Barrett, Hill RBF and Lada’s Super-formula were -2.55±3.21 D, -0.75±2.5 D, -3.35±4.43 D, -1.15±2.64 D respectively. Mean IOL power used was -1.15 ± 2.81 D. Expected post op refraction with the four formulae were -0.2± 0.1 (SRK-T), -0.19±0.2 (Barrett), – 0.21 ± 0.18 (Hill-RBF), -0.17 ± 0.09 (Ladas). Post op mean spherical equivalent at 1 mth was -0.54 ±1.21 D. Conclusion: The differences between the formulae were statistically and clinically insignificant though the Hill-RBF gave the minimum prediction error
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