title: Effect of cataract extraction on the visual field decay rate in patients with glaucoma.
abstract: OBJECTIVE
  A visual field parameter that is resistant to cataract formation and extraction would help monitor glaucomatous visual field progression in patients with coexisting glaucoma and cataract.
  
  
  OBJECTIVE
  To evaluate the effect of cataract surgery on the slow and fast components of visual field decay in a group of patients with glaucoma.
  
  
  METHODS
  Retrospective, interventional, longitudinal study. Eighty-five eyes of 68 patients with open-angle glaucoma who had cataract extraction were included. All patients had 5 or more reliable visual field measurements before and after surgery.
  
  
  METHODS
  A pointwise exponential regression was used to perform trend analysis on thresholds at visual field test locations before and after cataract surgery. The test locations were ranked according to the decay rate and were partitioned into slow and fast groups.
  
  
  METHODS
  The slow and fast visual field rate components were measured before and after cataract surgery and were compared. Linear regressions of the mean deviation and the visual field parameter were performed against time and were compared before and after surgery.
  
  
  RESULTS
  The mean (SD) mean deviation was -5.5 (5.1) dB before cataract surgery and -5.0 (4.9) dB after cataract surgery (P = .002). The mean (SD) Visual Field Index was 86.4% (13.5%) before cataract surgery and 86.6% (13.3%) after cataract surgery (P = .30). The mean (SD) slow component rate decreased from 0.48% (0.73%) per year before surgery to 0.26% (0.42%) per year after surgery (P = .04). No statistically significant difference was identified in the fast component mean (SD) rate per year before surgery (3.37% [4.05%]) vs per year after surgery (3.46% [3.56%]) (P = .29).
  
  
  CONCLUSIONS
  Cataract progression seems to be the main determinant for the slow visual field rate component and does not change the fast visual field rate component. We conclude that the method used can help reduce the confounding effects of cataract progression and cataract extraction on measured perimetric progression in glaucoma.
authors: Jules Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California2Department of Ophthalmology, Pusan National University School of Medicine, Busan, Korea.
authors: Ji-Woong
authors: JW
authors: Lee
authors: Jules Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California.
authors: Esteban
authors: E
authors: Morales
authors: Jules Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California3Department of Biostatistics, Jonathan and Karin Fielding School of Public Health at the University of California, Los Angeles.
authors: Fei
authors: F
authors: Yu
authors: Department of Biostatistics, Jonathan and Karin Fielding School of Public Health at the University of California, Los Angeles.
authors: Abdelmonem A
authors: AA
authors: Afifi
authors: Jules Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California.
authors: Eun-Ah
authors: EA
authors: Kim
authors: Jules Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California.
authors: Niloufar
authors: N
authors: Abdollahi
authors: Jules Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California.
authors: Kouros
authors: K
authors: Nouri-Mahdavi
authors: Jules Stein Eye Institute, David Geffen School of Medicine at UCLA, Los Angeles, California.
authors: Joseph
authors: J
authors: Caprioli
mesh_terms: D000368:Aged; D002386:Cataract / Q000150:complications*; D005260:Female; D005500:Follow-Up Studies; D005902:Glaucoma, Open-Angle / Q000150:complications* / Q000503:physiopathology*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology; D019654:Lens Implantation, Intraocular; D008297:Male; D018918:Phacoemulsification; D012189:Retrospective Studies; D014065:Tonometry, Ocular; D014786:Vision Disorders / Q000503:physiopathology*; D014792:Visual Acuity / Q000502:physiology; D058609:Visual Field Tests; D014794:Visual Fields / Q000502:physiology*