Risk Factors for Presence of Cystoid Macular Edema following Rhegmatogenous Retinal Detachment Surgery

Purpose: Cystoid macular edema (CME) following cataract surgery is a well-known entity. Less is known regarding the risk factors of developing CME following repair of rhegmatogenous retinal detachments (RRD).Methods: This was a multi-institutional study of primary RRD surgeries from 1/1/2015 through 12/31/2015. The primary outcome was the development of postoperative CME following RRD surgery. Post-operative optical coherence tomography imaging and 3 months of follow-up following RRD repair were required.Results: There were 1,466 eyes that met the inclusion criteria, and 140 (9.6%) developed postoperative CME following primary RRD repair. On multivariate analysis, the statistically significant metrics were older patient age (OR 1.03 per year, 95% CI 1.01 to 1.05), pre-operative proliferative vitreoretinopathy (PVR, OR 1.74, 95% 1.03 to 2.95), and cataract surgery following RRD repair (OR 2.18, 95% CI 1.47 to 3.25). Single surgery success was protective against CME (OR 0.20 (95% CI 0.14-0.30). Seventy-six (9.0%) of the phakic eyes and 60 (9.9%) of the pseudophakic eyes developed post-operative CME. Multivariate analysis showed that cataract surgery following RRD repair (p < .0001) for phakic eyes and older age (p = .0075) for pseudophakic eyes were risk factors. In eyes that underwent successful retinal reattachment with one surgery, post-operative cataract surgery (p = .0005) and pre-operative PVR (p = .0011) were risk factors for CME in this subgroup.Conclusion: CME occurred in nearly 10% of the eyes following RRD repair. The biggest risk factors were recurrent RRD, preexisting PVR, older age, and cataract surgery following RRD repair.