title: Effect of cataract extraction on SITA perimetry in patients with glaucoma.
abstract: OBJECTIVE
  To evaluate the effect of cataract extraction on Swedish Interactive Thresholding Algorithm (SITA) perimetry in patients with coexisting cataract and glaucoma.
  
  
  METHODS
  This is a retrospective noncomparative interventional study. Thirty-seven consecutive patients with open-angle glaucoma who had cataract extraction alone or combined with trabeculectomy were included. All patients had SITA-standard 24-2 visual fields before and after the surgery. The main outcome measures were changes in mean deviation (MD) and pattern standard deviation (PSD). Additionally, changes in best-corrected visual acuity, intraocular pressure, and number of glaucoma medications were also studied.
  
  
  RESULTS
  Visual field tests were performed 3.9+/-4.4 months before surgery and 4.1+/-2.8 months after surgery. Mean visual acuity improved after the surgery, from 0.41+/-0.21 to 0.88+/-0.32 (P<0.001). After cataract extraction, SITA-standard mean MD improved from -12.3+/-5.8 to -11.1+/-6.3 (P=0.023), whereas the change in mean PSD was statistically nonsignificant (from 7.2+/-3.0 to 7.3+/-3.6; P=0.84).
  
  
  CONCLUSIONS
  In glaucoma patients examined with SITA-standard, MD improved but PSD change was statistically nonsignificant, after the cataract surgery. SITA-standard PSD can be used to monitor glaucoma progression in patients with coexisting glaucoma and cataract.
authors.affiliation: Department of Ophthalmology, NHS Grampian, United Kingdom.
authors.forename: M A
authors.initials: MA
authors.lastname: Rehman Siddiqui
authors.forename: Hany A
authors.initials: HA
authors.lastname: Khairy
authors.forename: Augusto
authors.initials: A
authors.lastname: Azuara-Blanco
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D002386:Cataract / Q000503:physiopathology; D005260:Female; D005902:Glaucoma, Open-Angle / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D007429:Intraocular Pressure; D019654:Lens Implantation, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D012189:Retrospective Studies; D014130:Trabeculectomy; D014786:Vision Disorders / Q000175:diagnosis*; D014792:Visual Acuity; D058609:Visual Field Tests; D014794:Visual Fields