title: Corneal topographic changes after scleral buckling.
abstract: OBJECTIVE
  To evaluate corneal topographic changes and induced corneal astigmatism after scleral buckling (SB).
  
  
  METHODS
  This interventional case series includes all patients who had undergone scleral buckling for rhegmatogenous retinal detachment (RRD) during a 1-year period. Patients were divided into four groups according to type and extent of scleral buckling which depended on the discretion of a retina specialist. Videokeratography was performed for all patients preoperatively and repeated 1 and 3 months after SB.
  
  
  RESULTS
  Thirty-nine eyes of 39 patients (29 male, 74.7%) with mean age of 50.35+/-20 years (range 13-80) were finally analyzed. There was no statistically significant difference among the groups in terms of preoperative corneal astigmatism, surface regularity index (SRI), surface asymmetry index (SAI), mean keratometry (mean K), and potential visual acuity (PVA ). Overall, preoperative mean K was 43.97+/-1.78 D, which reached 44.2+/-2.02 D and 43.92+/-2.16 D 1 and 3 months after the operation. Mean preoperative SRI was 0.58+/-0.4, which increased to 1.24+/-1.18 and 1.29+/-1.13 1 and 3 months after the operation respectively. Mean preoperative SAI was 0.39+/-0.21, which increased to 0.73+/-0.37 and 0.75+/-0.66 1 and 3 months after the procedure. Changes in SAI at 1 and 3 months following SB were significant (p values <0.001); however, these postoperative values were not significantly different. Mean preoperative PVA was 0.07+/-0.75 logMAR (equivalent to 20/20) but decreased to 0.24+/-0.25 (equivalent to 20/30) and 0.27+/-0.29 (equivalent to 20/40) 1 and 3 months after SB, respectively.
  
  
  CONCLUSIONS
  Significant changes in corneal topographic indices including increases in SRI and SAI and a concomitant decrease in PVA may occur after SB procedures. These induced changes must be considered and appropriately addressed postoperatively to provide the best possible corrected vision.
authors.affiliation: Department of Ophthalmology and Ophthalmic Research Center, Labbafinejad Medical Center (LMC), Shaheed Beheshti University of Medical Sciences, Boostan 9th Street, Pasdaran Avenue, Tehran, Iran 16666. karimianf@yahoo.com
authors.forename: F
authors.initials: F
authors.lastname: Karimian
authors.forename: S
authors.initials: S
authors.lastname: Moradian
authors.forename: S
authors.initials: S
authors.lastname: Yazdani
authors.forename: A
authors.initials: A
authors.lastname: Mashayekhy
authors.forename: A
authors.initials: A
authors.lastname: Anisian
authors.forename: N
authors.initials: N
authors.lastname: Kouhestani
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001251:Astigmatism / Q000209:etiology / Q000503:physiopathology*; D003315:Cornea / Q000503:physiopathology*; D019781:Corneal Topography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D011446:Prospective Studies; D012163:Retinal Detachment / Q000601:surgery*; D012591:Scleral Buckling / Q000009:adverse effects*; D014792:Visual Acuity