title: Ultrasound biomicroscopy of the iridocorneal angle of the eye before and after phacoemulsification and intraocular lens implantation in dogs.
abstract: OBJECTIVE
  To compare the iridocorneal angle (ICA) and angle opening distance (AOD) in dogs with cataractous and noncataractous lenses; evaluate cataractous eyes ultrasono-graphically for association of postoperative ocular hypertension (POH) with the ICA, AOD, and postoperative echogenic anterior chamber debris; and evaluate intraobserver reliability associated with ICA and AOD measurements.
  
  
  METHODS
  56 dogs with 102 cataracts, and 23 clinically normal dogs.
  
  
  METHODS
  Ultrasound biomicroscopy was performed on 102 eyes of 56 dogs before and after cataract surgery and on 46 nondilated and dilated eyes of 23 clinically normal dogs. Cataract stage, ICA, AOD, and association with POH were assessed.
  
  
  RESULTS
  Cataract stage and ICA or AOD were not significantly associated; however, ICA and AOD typically decreased with increasing cataract maturity. Before and after pupillary dilation, AODs were significantly smaller in cataractous eyes than in noncataractous eyes. Before surgery, ICA and AOD in eyes without pupillary dilation were significantly associated with POH. At > 13 degrees , odds of developing POH increased by 11% for each degree increase in the ICA. Postoperative anterior chamber debris was not associated with POH. Coefficient of variation for repeated measurements was 10% for the ICA and 9.5% for the AOD, suggesting good intraobserver reliability.
  
  
  CONCLUSIONS
  In this study, dogs with larger ICA and AOD measurements before surgery were at greater risk of developing POH. This information may be useful for future studies to determine whether preventative treatment for POH administered prior to surgery may be beneficial.
authors.affiliation: Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA.
authors.forename: Michelle D
authors.initials: MD
authors.lastname: Rose
authors.forename: John S
authors.initials: JS
authors.lastname: Mattoon
authors.forename: Ann J
authors.initials: AJ
authors.lastname: Gemensky-Metzler
authors.forename: David A
authors.initials: DA
authors.lastname: Wilkie
authors.forename: Päivi J
authors.initials: PJ
authors.lastname: Rajala-Schultz
mesh_terms: D000818:Animals; D002386:Cataract / Q000662:veterinary*; D004283:Dog Diseases / Q000601:surgery*; D004285:Dogs; D005123:Eye / Q000033:anatomy & histology* / Q000473:pathology; D005260:Female; D006262:Health; D019654:Lens Implantation, Intraocular / Q000662:veterinary*; D008297:Male; D033401:Microscopy, Acoustic / Q000662:veterinary*; D018918:Phacoemulsification / Q000662:veterinary*