Evaluation by M-charts and microperimetry after broad internal limiting membrane peeling for idiopathic epiretinal membrane

Abstract Purpose: To assess the impact of broad-internal limiting membrane (ILM) peeling on retinal sensitivity (RS) in patients with idiopathic epiretinal membrane (ERM). Design: Retrospective observational case series. Methods: The study analyzed 22 eyes treated with broad-ILM peeling within the vascular arcades area for ERM, over a 6-month follow-up. Outcomes measured included best-corrected visual acuity (BCVA), M-CARTS scores (vertical MV and horizontal MH), central macular thickness (CMT), and RS. RS was evaluated using Microperimetry-3 at specified central degrees, and points below 10 dB were considered microscotomas (MS). Results: Postoperative BCVA improved significantly at 1, 3, and 6 months (P < 0.01). No significant changes in CMT were noted. MH score improvements were significant at 6 months (P = 0.02), whereas MV scores remained unchanged. RS notably improved within the central 4° at all postoperative points (P < 0.05) but remained unchanged in the central 10° and 20° regions. MS increased transiently at 1 month (P = 0.04) but stabilized at 3 and 6 months. Conclusion: MS increased temporarily but improved over time. Broad ILM peeling suggests potential for improving visual acuity and metamorphopsia in ERM patients without causing long-term detrimental effects on retinal sensitivity.