Comparison of Microperimetry Outcomes in Monofocal and Trifocal Intraocular Lens Recipients

Purpose This study aimed to compare the effects of trifocal (TF) and monofocal intraocular lenses (MF-IOL) on microperimetry outcomes in patients who underwent uncomplicated cataract surgery. Methods A total of 44 MF-IOL and 38 TF-IOL recipients were evaluated six months postoperatively. Corrected distance visual acuity (CDVA) was assessed using a standard logMAR chart. Microperimetry assessments were performed using the MP-1 microperimeter to measure retinal sensitivity (RS) at 2°, 6°, and 10°, fixation points (FP) within 2° and 4°; and fixation stability. Fixation stability was quantified using the Bivariate Contour Ellipse Area (BCEA). Contrast sensitivity was assessed separately using the Pelli-Robson chart. Results The MF-IOL group exhibited significantly higher CS (1.80±0.10 vs. 1.70±0.11, p<0.01) and better CDVA (p=0.044). Retinal sensitivity was also greater at RS-2° (p=0.036), RS-6° (p=0.014), and RS-10° (p=0.01). Fixation stability was better in the MF-IOL group, with significantly smaller BCEA values at 1SD (1292±1128 vs. 2027±1637 min arc², p=0.013), 2SD (3551±3164 vs. 5416±4454 min arc², p=0.032), and 3SD (6361±5685 vs. 9654±7929 min arc², p=0.029). FP-2° was also higher in the MF-IOL group (p=0.012), while FP-4° and fixation location showed no significant differences. Conclusion MF-IOLs provided superior contrast sensitivity, retinal sensitivity, and fixation stability compared to TF-IOLs, indicating better postoperative visual function.