Accuracy of New Intraocular Lens Calculation Formulae in eyes undergoing Silicone Oil Removal/Pars Plana Vitrectomy-cataract surgery

To investigate the performance of novel intraocular lens (IOL) calculation formulae (Barrett Universal II [BUII], Emmetropia Verifying Optical [EVO], and Kane) and conventional formulae (Haigis, Hoffer Q, Holladay 1, and SRK/T) in patients who underwent pars plana vitrectomy (PPV) or silicone oil removal (SOR) combined with cataract surgery.In total, 301 eyes from 301 patients underwent PPV/SOR with concomitant cataract surgery were enrolled and divided into four groups according to preoperative diagnosis: silicone oil-filled eyes after PPV, epiretinal membrane, primary retinal detachment (RD), and macular hole.BUII exhibited the smallest mean absolute error (MAE) (0.65 diopters [D]) and median absolute error (MedAE) (0.39 D) in total. In patients with RD, each formula exhibited the worst refractive outcomes in diverse vitreoretinal pathologies (P<.01), and no difference in accuracy between the seven formulas was observed (P=.075). For long eyes, the second linear (WK2) version of the Wang-Koch adjustment significantly reduced the MedAE for Holladay 1 and SRK/T (P<.001 and P=.019).In combined surgery, both new and conventional formulas using WK2 adjustment demonstrated satisfactory performance, with BUII exhibiting the best overall performance. However, in patients with RD, all seven formulas showed less favorable performance.