title: Impact of intraocular pressure after filtration surgery on visual field progression in primary open-angle glaucoma.
abstract: OBJECTIVE
  To compare visual field progression after trabeculectomy in eyes showing a postoperative intraocular pressure (IOP) less than or equal to 16 mmHg and eyes with an IOP of 17 to 21 mmHg.
  
  
  METHODS
  A retrospective cohort study design was used. A total of 101 eyes of 101 consecutive patients undergoing trabeculectomy for primary open-angle glaucoma (POAG) with a postoperative IOP less than or equal to 21 mmHg were divided into two groups: Group 1 included eyes showing a postoperative IOP less than or equal to 16 mmHg at all visits and Group 2 included eyes with a postoperative IOP between 17 and 21 mmHg. In turn, each of these groups was divided into two subgroups according to whether treatment was required for IOP control. Glaucomatous visual field control during follow-up was compared between the subject groups.
  
  
  RESULTS
  Kaplan-Meier analysis revealed glaucomatous visual field control in 98.53% of the eyes in Group 1 and 89.06% of those in Group 2 at 5 years, the difference between the groups being significant.
  
  
  CONCLUSIONS
  Glaucomatous disease progression is less frequent when IOP is less than or equal to 16 mmHg in all the follow-up visits after trabeculectomy. The results indicate a definite benefit of low IOP in visual field control.
authors.affiliation: Hospital Provincial, Toledo, Spain. crlg3000@ya.com
authors.forename: C
authors.initials: C
authors.lastname: Lazaro
authors.forename: J
authors.initials: J
authors.lastname: Garcia-Feijoo
authors.forename: A
authors.initials: A
authors.lastname: Castillo
authors.forename: J
authors.initials: J
authors.lastname: Perea
authors.forename: J M
authors.initials: JM
authors.lastname: Martinez-Casa
authors.forename: J
authors.initials: J
authors.lastname: Garcia-Sanchez
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D005902:Glaucoma, Open-Angle / Q000503:physiopathology* / Q000601:surgery; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D014065:Tonometry, Ocular; D014130:Trabeculectomy; D016896:Treatment Outcome; D014786:Vision Disorders / Q000503:physiopathology*; D014794:Visual Fields / Q000502:physiology*