title: Do pattern deviation values accurately estimate glaucomatous visual field damage in eyes with glaucoma and cataract?
abstract: OBJECTIVE
  To study the efficacy of pattern deviation (PD) values in the estimation of visual field compensating the influence of cataract in eyes with glaucoma.
  
  
  METHODS
  The study subjects comprised of 48 eyes of 37 glaucoma patients. Mean total deviation value (mTDs) on Humphrey Field Analyzer after cataract surgery was compared with mean PD (mPD) before the surgery. Visual field measurements were carried out ≤6 months before (VF(pre)) and following (VF(post)) successful cataract surgery. The difference between the mPD or mTD values in the VF(pre) and mTD values in the VF(post) (denoted as εmPD/ΔmTD) was calculated, and the influence of the extent of 'true' glaucomatous visual field damage or cataract (as represented by εmPD and ΔmTD, respectively) on this difference was also investigated.
  
  
  RESULTS
  There was a significant difference between mTD in the VF(pre) and mTD in the VF(post) (p<0.001, repeated measures analysis of variance). There was not a significant difference between mPD in the VF(pre) and mTD in the VF(post) (p=0.06); however, εmPD was significantly correlated with the mTD in VF(post) and also ΔmTD (R(2)=0.56 and 0.27, p<0.001, Pearson's correlation). The accurate prediction of the mTD in the VF(post) can be achieved using the pattern standard deviation (PSD), mTD and also visual acuity before surgery.
  
  
  CONCLUSIONS
  Clinicians should be very careful when reviewing the VF of a patient with glaucoma and cataract since PD values may underestimate glaucomatous VF damage in patients with advanced disease and also overestimate glaucomatous VF damage in patients with early to moderate cataract.
authors: Department of Ophthalmology, The University of Tokyo Graduate School of Medicine, Tokyo, Japan.
authors: Aya
authors: A
authors: Matsuda
authors: Hara Eye Hospital, Tochigi, Japan.
authors: Takeshi
authors: T
authors: Hara
authors: Miyata Eye Hospital, Miyakonojo, Miyazaki, Japan.
authors: Kazunori
authors: K
authors: Miyata
authors: Matsuo Eye Clinic, Tokyo, Japan.
authors: Hiroshi
authors: H
authors: Matsuo
authors: Department of Ophthalmology, The University of Tokyo Graduate School of Medicine, Tokyo, Japan.
authors: Hiroshi
authors: H
authors: Murata
authors: Department of Ophthalmology, The University of Tokyo Graduate School of Medicine, Tokyo, Japan.
authors: Chihiro
authors: C
authors: Mayama
authors: Department of Ophthalmology, The University of Tokyo Graduate School of Medicine, Tokyo, Japan.
authors: Ryo
authors: R
authors: Asaoka
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D002386:Cataract / Q000150:complications / Q000503:physiopathology*; D002387:Cataract Extraction; D005260:Female; D005901:Glaucoma / Q000150:complications / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014786:Vision Disorders / Q000175:diagnosis* / Q000209:etiology; D014792:Visual Acuity; D058609:Visual Field Tests / Q000379:methods*; D014794:Visual Fields
keywords: Glaucoma