Inclusion Criteria:  primary rhegmatogenous retinal detachment treated with vitrectomy with gas tamponade; follow-up of 3 months or more; age > 18 years ; no previous eye surgery, except cataract surgery performed at least 6 months after hospitalization for retinal detachment; anatomical success, i.e. retinal re-attachment, after a single gas vitrectomy; no other eye surgery during follow-up; availability of optical coherence tomography (OCT) imaging  Exclusion Criteria:  history of other eye diseases (glaucoma, age-related macular degeneration, uveitis, diabetic retinopathy, maculopathy); macular hole; recurrent retinal detachment; use of silicone oil is used as a tamponading agent