Corneal topography changes after vitreoretinal surgery

The authors report the results of a prospective study to assess corneal topography changes after vitreoretinal surgery procedures. Computer-assisted videokeratography using a Topographic Modeling System-1 (TMS-1) were prospectively performed before and after vitreoretinal surgery (vitrectomy with or without scleral buckling) in 12 eyes (patients) with varied vitreoretinal pathology, including cytomegalovirus (CMV) retinitis, CMV-related retinal detachment, retinal detachment with and without proliferative vitreoretinopathy, trauma, acute retinal necrosis, and macular hole. Preoperative and postoperative surface regularity index (SRI), surface asymmetry index (SAI), and induced astigmatism were determined. Patients were followed for an average of 6 months (range: 2-15 months). Mean preoperative SRI was 0.52 (0.05-1.06) and postoperative SRI was 0.73 (0.25-1.36). Mean preoperative SAI was 0.43 (0.22-0.93) and postoperative SAI was 0.56 (0.21-0.99). Mean induced astigmatism was 0.7 diopters. Our study suggests that the central corneal optical quality (SRI) and the asymmetricity of the anterior corneal curvature (SAI) deteriorates after vitreoretinal surgery.