title: Intraocular pressure control after clear corneal phacoemulsification in eyes with previous trabeculectomy: a controlled study.
abstract: OBJECTIVE
  To compare intraocular pressure (IOP) control in eyes with or without clear corneal phacoemulsification following trabeculectomy.
  
  
  METHODS
  The study group included 30 eyes that underwent uneventful clear corneal phacoemulsification and foldable intraocular lens implantation following trabeculectomy without antimetabolites. Thirty eyes that had undergone filtering surgery without cataract extraction were selected as controls. Case and control groups were matched with respect to age, gender, IOP, number of glaucoma medications, glaucoma type (primary open-angle glaucoma/pseudoexfoliative glaucoma), trabeculectomy time and follow-up. Comparisons between the study and control groups (intergroup) and within the same group at different time-points (intragroup) were performed for IOP, glaucoma medications and bleb morphology. Success rates were investigated by Kaplan-Meier survival analysis and the factors influencing final success by logistic regression.
  
  
  RESULTS
  Intraocular pressure (p = 0.04) and glaucoma medications (p = 0.001) increased during an average follow-up of 26.1 +/- 9.9 months in both groups. Intragroup differences became statistically significant after the 6-month visit, but intergroup differences remained insignificant. Bleb height decreased significantly following phacoemulsification in the study group (p = 0.017). Success rates decreased with time in both groups, with no intergroup difference (p = 0.46). The final success rate was negatively correlated with IOP and number of glaucoma medications used at the study entry, while there was a positive correlation between the baseline and final success rates.
  
  
  CONCLUSIONS
  Trabeculectomy success decreased in a time-dependent manner in eyes with and without subsequent phacoemulsification. Uncomplicated clear corneal phacoemulsification was not found to have any additional unfavorable influence on IOP control in eyes with filtering blebs.
authors.affiliation: Beyoğlu Eye Education and Research Hospital, Istanbul, Turkey.
authors.forename: Asli
authors.initials: A
authors.lastname: Inal
authors.forename: Sükrü
authors.initials: S
authors.lastname: Bayraktar
authors.forename: Berkay
authors.initials: B
authors.lastname: Inal
authors.forename: Zerrin
authors.initials: Z
authors.lastname: Bayraktar
authors.forename: Omer Faruk
authors.initials: OF
authors.lastname: Yilmaz
mesh_terms: D000368:Aged; D003315:Cornea / Q000601:surgery; D017889:Exfoliation Syndrome / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D005902:Glaucoma, Open-Angle / Q000601:surgery*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D019654:Lens Implantation, Intraocular / Q000379:methods*; D008297:Male; D018918:Phacoemulsification / Q000379:methods*; D011184:Postoperative Period; D011379:Prognosis; D013997:Time Factors; D014130:Trabeculectomy