title: Ultrasound biomicroscopy in the comparison of the anterior segment morphometry before and after pars plana vitrectomy.
abstract: OBJECTIVE
  To determine if pars plana vitrectomy induces long-term changes in the anterior segment anatomy by means of ultrasound biomicroscopy.
  
  
  METHODS
  A prospective case series study was undertaken of consecutive patients referred to a tertiary eye care centre for pars plana vitrectomy as the only procedure. Twenty eyes of 20 patients undergoing pars plana vitrectomy alone were studied by ultrasound biomicroscopy. Silicone oil or scleral buckle was not used in any of the included cases. The following morphometric parameters were compared before and after 3 months of surgery: anterior chamber depth, angle-opening distance at 500 microm from the scleral spur, trabecular-ciliary process distance, ciliary body thickness at 1, 2 and 3 millimeters from the scleral spur and measurement of the supraciliary space thickness, when fluid was detected.
  
  
  RESULTS
  No statistically significant differences were found between the preoperative and the postoperative morphometric parameters.
  
  
  CONCLUSIONS
  Uncomplicated pars plana vitrectomy does not induce any long-term change on anterior segment morphometry. Based on these findings, the normal long-term pattern to be expected after pars plana vitrectomy is the conservation of the preoperative morphometry.
authors.affiliation: The New York Eye and Ear Infirmary, New York Medical College, NY, USA. fmarigo@terra.com.br
authors.forename: Flavio de Andrade
authors.initials: Fde A
authors.lastname: Marigo
authors.forename: Márcio
authors.initials: M
authors.lastname: Zisman
authors.forename: Márcio Bittar
authors.initials: MB
authors.lastname: Nehemy
authors.forename: Patrícia Vianna Brandão
authors.initials: PV
authors.lastname: Marigo
mesh_terms: D000328:Adult; D000368:Aged; D000869:Anterior Eye Segment / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000473:pathology; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D033401:Microscopy, Acoustic / Q000379:methods*; D008875:Middle Aged; D011184:Postoperative Period; D011300:Preoperative Care; D011446:Prospective Studies; D012164:Retinal Diseases / Q000601:surgery*; D014821:Vitrectomy / Q000009:adverse effects* / Q000379:methods