title: Rotational stability of a single-piece hydrophobic acrylic intraocular lens during removal of ophthalmic viscosurgical devices.
abstract: OBJECTIVE
  To compare the effect of cohesive and dispersive ophthalmic viscosurgical device (OVD) on intraoperative rotational stability of the intraocular lens (IOL) with single-piece hydrophobic acrylate platform.
  
  
  METHODS
  Prospective, comparative study.
  
  
  METHODS
  This institutional clinical study included 60 eyes of 60 patients who underwent phacoemulsifcation. The patients were equally divided into cohesive OVD (Healon GV; Abbott Medical Optics, Abbott Park, Illinois, USA) group and dispersive OVD (Viscoat; Alcon Laboratories, Fort Worth, Texas, USA) group. Image analysis from the captured digital image was used to measure intraoperative rotation of single-piece hydrophobic acrylate IOL (SA60AT or SA60NT) during OVD removal.
  
  
  RESULTS
  Mean intraoperative rotation was 7.42 degrees +/- 4.16 (standard deviation) in dispersive OVD group and 13.08 degrees +/- 5.25 (standard deviation) in cohesive OVD group (P < .001). Twenty-one cases (70%) maintained the alignment within 10 degrees during removal of OVD with dispersive OVD, while only 9 cases (30%) did so with cohesive OVD (P = .005). Counterclockwise rotation was observed in 33% of the all cases.
  
  
  CONCLUSIONS
  This study showed that a significant amount of IOL rotation occurred during OVD removal. Intraoperative rotational stability of IOL was greater with Viscoat than with Healon GV.
authors.affiliation: Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea. jyhyon@snu.ac.kr
authors.forename: Joon Young
authors.initials: JY
authors.lastname: Hyon
authors.forename: Hwan Eok
authors.initials: HE
authors.lastname: Yeo
mesh_terms: D000180:Acrylic Resins; D000368:Aged; D002807:Chondroitin; D002809:Chondroitin Sulfates; D004322:Drainage; D004338:Drug Combinations; D006801:Humans; D006820:Hyaluronic Acid; D057927:Hydrophobic and Hydrophilic Interactions; D007431:Intraoperative Complications; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D018918:Phacoemulsification; D011446:Prospective Studies; D012399:Rotation; D055675:Viscosupplements
chemical_list: D000180:Acrylic Resins; D004338:Drug Combinations; D055675:Viscosupplements; C501944:chondroitin sulfate, sodium hyaluronate drug combination; D006820:Hyaluronic Acid; D002807:Chondroitin; D002809:Chondroitin Sulfates