title: [Causes of visual field defects after vitrectomy].
abstract: OBJECTIVE
  An inferotemporal visual field defect sometimes occurs following vitreous surgery for idiopathic macular hole. There is a possibility that this visual field defect is due to damage to the superonasal retina by fluid or air irrigation through an inferonasal infusion port. We tested this hypothesis by placing the infusion port in the inferonasal sector during vitreous surgery.
  
  
  METHODS
  We performed vitreous surgery on 31 eyes with idiopathic macular hole. The infusion port was placed in the inferonasal sector. The vitreous cavity was replanced either by 20% SF6 or 12% C3F8. We did not abrade the retinal pigment epithelium within the hole. The visual field was assessed before and 1 month after surgery using a Goldmann perimeter.
  
  
  RESULTS
  Three eyes developed a wedge-shaped visual field defect in the inferonasal sector. No visual field defect developed in the other 28 eyes.
  
  
  CONCLUSIONS
  The findings show that visual field defect following surgery for idiopathic macular hole is dependent upon the site of the infusion port. We presume that the visual field defect is consequent to retinal damage caused by the flow of air or fluid during surgery.
authors.affiliation: Tane Memorial Eye Hospital, Osaka, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Takenaka
authors.forename: T
authors.initials: T
authors.lastname: Maeno
authors.forename: T
authors.initials: T
authors.lastname: Mano
authors.forename: H
authors.initials: H
authors.lastname: Mitsuda
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D012160:Retina / Q000293:injuries; D012167:Retinal Perforations / Q000601:surgery; D007507:Therapeutic Irrigation / Q000009:adverse effects; D014794:Visual Fields; D014821:Vitrectomy