title: [Study of torsional movements in refractive surgery].
abstract: OBJECTIVE
  To observe torsional movements of the eye in refractive surgery, and their possible consequences in the surgery outcome.
  
  
  METHODS
  In a prospective study, 49 eyes of 40 patients were submitted to surgical correction of astigmatism, by the LASIK technique. Patients were divided in two groups based on the cylindric power. Group A from -0.25 to -2.00D; group B from -2.25 to -6.00D. The occurrence of torsional movements was recorded in all patients, and based on this, the axis of treatment was corrected.
  
  
  RESULTS
  Mean torsion was 3.5 masculine +/- in group A; and 4.5 masculine+/- in group B. There was no statistical difference between the two groups.
  
  
  CONCLUSIONS
  Torsional movements occurred in almost all cases, and therefore should be corrected if one desires best results. This is specially important in matching personalized data captured in wave front analyzers for the eye at the time of surgery.
authors.affiliation: Hospital de Olhos de Paraná, Rua Cel. Dulcídio 199, 4o. andar, CEP 80420-170 Curitiba, PR. guigojnmr@hotmail.com
authors.forename: Guilherme José Nunes Marques
authors.initials: GJ
authors.lastname: Rocha
authors.forename: Otávio
authors.initials: O
authors.lastname: Siqueira Bisneto
authors.forename: Hamilton
authors.initials: H
authors.lastname: Moreira
mesh_terms: D001251:Astigmatism / Q000601:surgery*; D005133:Eye Movements / Q000502:physiology*; D005260:Female; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000295:instrumentation; D008297:Male; D011446:Prospective Studies; D012737:Sex Factors; D014102:Torsion Abnormality