title: A randomised prospective comparison of operative peripheral iridectomy and Nd:YAG laser iridotomy treatment of acute angle closure glaucoma: 3 year visual acuity and intraocular pressure control outcome.
abstract: OBJECTIVE
  To compare visual acuity and intraocular pressure outcomes 3 years after treatment of acute angle closure glaucoma (AACG) by operative peripheral iridectomy (PI) or Nd:YAG laser iridotomy (YAG PI).
  
  
  METHODS
  A prospective study of consecutive patients presenting to one ophthalmology department with uniocular AACG during a 2 year period. Following informed consent patients were randomised to bilateral PI or bilateral YAG PI. Three years after treatment the mean Snellen visual acuity converted to logMAR scores of the two groups was compared using the unpaired Student's t test. The number of patients with normal intraocular pressure with no further treatment in each group was compared using the chi 2 test with Yates's correction.
  
  
  RESULTS
  21 patients underwent bilateral PI and 27 bilateral YAG PI. Three years after treatment visual acuity was 0.30 (SD 0.28) log MAR units for PI eyes and 0.57 (0.67) logMAR units for YAG PI eyes (p = 0.08, NS). 15 (70.4%) PI eyes and 19 (71.8%) YAG PI eyes had an intraocular pressure less than 21 mm Hg with no further treatment (NS).
  
  
  CONCLUSIONS
  There was no significant difference in visual acuity or intraocular pressure control 3 years after treatment of AACG with PI or YAG PI.
authors.affiliation: Department of Ophthalmology, Royal Infirmary, Edinburgh.
authors.forename: B W
authors.initials: BW
authors.lastname: Fleck
authors.forename: E
authors.initials: E
authors.lastname: Wright
authors.forename: E A
authors.initials: EA
authors.lastname: Fairley
mesh_terms: D000368:Aged; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D007429:Intraocular Pressure; D007498:Iris / Q000601:surgery; D053685:Laser Therapy; D008297:Male; D011446:Prospective Studies; D018709:Statistics, Nonparametric; D016896:Treatment Outcome; D014792:Visual Acuity