title: Corneal topographic changes after retinal and vitreous surgery.
abstract: OBJECTIVE
  To investigate the topographic changes in the cornea after retinal and vitreous operations.
  
  
  METHODS
  Observational prospective case series.
  
  
  METHODS
  The study population included 46 patients after vitreoretinal surgery: 11 underwent pneumatic retinopexy, 10 underwent vitrectomy, and 25 underwent scleral buckling procedure.
  
  
  METHODS
  The corneal topography was measured by videokeratography with the absolute program and evaluated statistically by a quantitative comparative method, which was developed for this study, for the whole and the central cornea.
  
  
  METHODS
  The corneal topographic changes were measured in diopters (D), evaluating and comparing the preoperative and postoperative measurements.
  
  
  RESULTS
  None of the operative procedures changed the shape of the whole cornea. Vitrectomy induced radial steepening of the central cornea 1.2 to 1.6 D, corresponding to the scleral sutures. Central steepening (average, 2.2 D) was also noted in the first week after circular buckling, but it flattened (average, 1.4 D) after 1 to 3 months. When an additional radial or circumferential buckling element was added to the circular buckle, steepening of the entire cornea and radial steepening of the central cornea (average, 0.6-0.8 D) occurred in the first week and flattened or returned to baseline after 1 to 3 months. There was no correlation between the location of the additional buckling element and the corneal topographic change.
  
  
  CONCLUSIONS
  Corneal videokeratography is a useful tool for evaluating the postoperative corneal curvature. It showed that vitreoretinal surgery alters the shape of the cornea when buckling or scleral sutures are used, but pneumatic retinopexy does not.
authors.affiliation: Department of Ophthalmology, Rabin Medical Center, Petah Tiqva, Israel.
authors.forename: D
authors.initials: D
authors.lastname: Weinberger
authors.forename: H
authors.initials: H
authors.lastname: Lichter
authors.forename: N
authors.initials: N
authors.lastname: Loya
authors.forename: R
authors.initials: R
authors.lastname: Axer-Siegel
authors.forename: L
authors.initials: L
authors.lastname: Muzmacher
authors.forename: U
authors.initials: U
authors.lastname: Gabbay
authors.forename: Y
authors.initials: Y
authors.lastname: Yassur
mesh_terms: D000328:Adult; D000368:Aged; D001251:Astigmatism / Q000175:diagnosis / Q000209:etiology*; D003315:Cornea / Q000473:pathology; D019781:Corneal Topography; D003452:Cryosurgery; D005260:Female; D005466:Fluorocarbons / Q000008:administration & dosage; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012163:Retinal Detachment / Q000601:surgery*; D012591:Scleral Buckling / Q000009:adverse effects*; D013536:Suture Techniques; D014821:Vitrectomy / Q000009:adverse effects*
chemical_list: D005466:Fluorocarbons; C042852:perflutren