title: Corneal thickness and visual acuity after phacoemulsification with 3 viscoelastic materials.
abstract: OBJECTIVE
  To determine whether differences exist in visual acuity and corneal thickness after phacoemulsification using various viscoelastic substances.
  
  
  METHODS
  Phillips Eye Institute, Minneapolis, Minnesota, USA.
  
  
  METHODS
  Fifty patients having routine phacoemulsification cataract extraction and intraocular lens implantation by a single surgeon using the same technique were randomly assigned to receive intraoperative administration of 1 of 3 viscoelastic substances: Amvisc Plus(R) (sodium hyaluronate 1.6%), OcuCoat(R) (hydroxypropyl methylcellulose 2%), or Viscoat(R) (chondroitin sulfate 4%-sodium hyaluronate 3%). Visual acuity and corneal thickness on the first postoperative day were compared between groups.
  
  
  RESULTS
  Patients with a best corrected visual acuity (BCVA) of 20/40 or better 1 day postoperatively had significantly thinner corneas (596 microm) than those with a BCVA worse than 20/40 (639 microm). There were no differences in postoperative BCVA or percentage increase in central corneal pachymetry among the 3 viscoelastic groups.
  
  
  CONCLUSIONS
  Viscoat, Amvisc Plus, and OcuCoat were comparable in their ability to produce clear corneas and good vision after routine phacoemulsification.
authors.affiliation: Phillips Eye Institute, Minneapolis, Minnesota, USA.
authors.forename: E A
authors.initials: EA
authors.lastname: Davis
authors.forename: R L
authors.initials: RL
authors.lastname: Lindstrom
mesh_terms: D002807:Chondroitin / Q000008:administration & dosage*; D002809:Chondroitin Sulfates; D003315:Cornea / Q000033:anatomy & histology*; D004338:Drug Combinations; D006801:Humans; D006820:Hyaluronic Acid / Q000008:administration & dosage*; D065347:Hypromellose Derivatives; D007267:Injections; D007432:Intraoperative Period; D008747:Methylcellulose / Q000008:administration & dosage* / Q000031:analogs & derivatives*; D018918:Phacoemulsification / Q000379:methods*; D016037:Single-Blind Method; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology*; D014822:Vitreous Body
chemical_list: D004338:Drug Combinations; C501944:chondroitin sulfate, sodium hyaluronate drug combination; D065347:Hypromellose Derivatives; D006820:Hyaluronic Acid; D008747:Methylcellulose; D002807:Chondroitin; D002809:Chondroitin Sulfates