title: Alterations in the corneal topography after pars plana vitrectomy with the standard system of 20-gauge and the 25-gauge transconjunctival sutureless vitrectomy.
abstract: BACKGROUND
  To determine the alterations in the corneal topography after pars planavitrectomy with the system of 20- and 25-gauge.
  
  
  METHODS
  A total of 29 patients with vitreous hemorrhage. The first group (17 patients) had to undergo a pars planavitrectomy with the 20-gauge system, whereas the second (12 patients) had the pars planavitrectomy with the 25-gauge system. The corneal topography was analyzed in the pre-operation, in the first, third, and sixth months in the post-operation.
  
  
  RESULTS
  the group which underwent the standartvitrectomy registered a statistically significant difference in the keratometric difference (dK) in the first month compared to the pre-operation (p < 0,000), first month with the third month (p < 0,020), first month and sixth month (p < 0,008). In the 25-gauge system group significant statistical alterations did not occur.
  
  
  CONCLUSIONS
  astigmatism occurs in the first month post vitrectomy standard. The 25-gauge systemis notinducedastigmatism.
authors.affiliation: Lions Eye Bank Foundation, Goiânia-Goiás, Brazil. alcio3@hotmail.com
authors.forename: Alcio Coutinho
authors.initials: AC
authors.lastname: de Paula
authors.forename: João Jorge
authors.initials: JJ
authors.lastname: Nassaralla Júnior
authors.forename: Francisco Weliton
authors.initials: FW
authors.lastname: Rodrigues
authors.forename: Rodrigo Egídio
authors.initials: RE
authors.lastname: da Silva
authors.forename: Rodrigo Salustiano
authors.initials: RS
authors.lastname: Correa e Silva
authors.forename: David Roberto
authors.initials: DR
authors.lastname: Barbosa Junior
mesh_terms: D000328:Adult; D000368:Aged; D001251:Astigmatism / Q000175:diagnosis / Q000209:etiology*; D019781:Corneal Topography; D005260:Female; D006801:Humans; D008297:Male; D008866:Microsurgery / Q000379:methods*; D008875:Middle Aged; D011183:Postoperative Complications; D011446:Prospective Studies; D013536:Suture Techniques; D014821:Vitrectomy / Q000009:adverse effects / Q000379:methods*; D014823:Vitreous Hemorrhage / Q000601:surgery*; D055815:Young Adult