Comparison of microperimetry outcomes in monofocal and trifocal intraocular lens recipients

This study aimed to compare the effects of trifocal (TF) and monofocal intraocular lenses (Mono-IOL) on microperimetry outcomes in patients who underwent uncomplicated cataract surgery.

A total of 44 Mono-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.

The Mono-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 Mono-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 Mono-IOL group (p = 0.012), while FP-4° and fixation location showed no significant differences.

Mono-IOLs provided superior contrast sensitivity, retinal sensitivity, and fixation stability compared to TF-IOLs, indicating better postoperative visual function.