title: A simple method for detecting vitrectomy infusion line position in hazy media, in case of poor visualization.
abstract: OBJECTIVE
  To introduce a simple and practical method for detecting vitrectomy infusion line position in a hazy media.
  
  
  METHODS
  The position of the infusion cannula was evaluated before and during vitrectomy in 17 eyes of 17 patients with hazy media. This procedure was performed by using the light pipe inserted partially into the cannula and determining the color of transmitted light into the vitreous cavity. Dark red or brownish color was considered as suprachoroidal placement and bright whitish color as the correct position of the cannula tip.
  
  
  RESULTS
  In 13 patients, the position of the cannula was considered as a precise position by using the aforementioned method at the beginning of the operation, and vitrectomy was performed without any infusion line-related complications. In two cases, the incorrect placement of the infusion cannula was confirmed with this technique, and the cannula was reinserted and repositioned. In two cases, secondary slippage of the cannula in suprachoroidal space was detected by using this method during vitrectomy, and another cannula was tried in another position.
  
  
  CONCLUSIONS
  Using the color of light pipe inserted partially into the cannula is a safe and simple method for evaluating the position of the infusion line in the eye.
authors.affiliation: Retina Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
authors.forename: Nasser
authors.initials: N
authors.lastname: Shoeibi
authors.forename: Mohammad-Rea
authors.initials: MR
authors.lastname: Ansari-Astaneh
mesh_terms: D002404:Catheterization / Q000379:methods*; D057785:Catheters; D015862:Choroid Diseases / Q000517:prevention & control; D006801:Humans; D007431:Intraoperative Complications / Q000517:prevention & control; D014821:Vitrectomy / Q000295:instrumentation*; D014822:Vitreous Body / Q000473:pathology*