Progression to Surgery for Patients With Idiopathic Epiretinal Membranes and Good Vision.

Backround And Objective: Patients with idiopathic epiretinal membranes (ERMs) and visual acuity of 20/40 or better are often monitored until vision or associated symptoms worsen to affect everyday living. This study looks at the rate of progression to surgery and the characteristics associated with progression.

Patients And Methods: This study was a retrospective, consecutive case series of patients with newly diagnosed idiopathic ERMs who were referred to the Retina Service at the Ophthalmic Consultants of Boston between January 2009 and May 2015 with 20/40 or better visual acuity. Surgical membrane peel was typically offered when vision worsened to 20/50 or beyond and/or when patients could not tolerate symptoms attributable to the ERM. All eligible eyes were categorized by baseline optical coherence tomography (OCT) morphology into normal, mild or incomplete, or complete loss of foveal contour. Visual acuities were averaged through conversion to logMAR. Kaplan-Meier survival curves for progression to surgical membrane peel were calculated. The main outcome measure was progression to surgical intervention.

Results: The study included 201 eyes from 170 patients; 29.8% had normal, 18.9% had mild loss, and 51.2% had complete loss of foveal contour on baseline OCT. Overall, 13% of eyes progressed to surgery at 7 years. However, only 5% of eyes with normal foveal contour progressed to surgery by 5.5 years, whereas 17% with incomplete and 16% with complete loss of foveal contour progressed to surgery at 6 and 7 years, respectively. Eyes with worse foveal contours progressed to surgery more rapidly.

Conclusion: A minority of patients with newly diagnosed ERMs who did not need surgical intervention progressed to needing surgery at 7 years with the rate and speed of progression dependent on baseline OCT morphology. These statistics can be useful in counseling patients who are deciding between watchful waiting and surgical intervention. [Ophthalmic Surg Lasers Imaging Retina. 2018;49:S18-S22.].