title: Effect of cataract extraction on blue-on-yellow visual field.
abstract: OBJECTIVE
  It is assumed that cataract can influence the results of blue-on-yellow perimetry. However, actual sensitivity change in blue-on-yellow perimetry before and after cataract surgery has not been fully demonstrated.
  
  
  METHODS
  Prospective.
  
  
  METHODS
  Institutional.
  
  
  METHODS
  Twenty-two eyes of 22 consecutive patients without ocular pathology, other than cataract, known to influence visual field undergoing cataract surgery.
  
  
  METHODS
  Both white-on-white (W-W) and blue-on-yellow (B-Y) perimetries.
  
  
  METHODS
  Global indexes including mean deviation and other pertinent data of white-on-white and blue-on-yellow perimetries were compared before and after cataract surgery.
  
  
  RESULTS
  Mean deviation was improved after cataract surgery in both white-on-white perimetry (from -6.88 dB to -3.36 dB, P <.0001) and blue-on-yellow perimetry (from -12.22 dB to -3.64 dB, P <.0001, paired t test). However, the mean difference between preoperative and postoperative mean deviation in blue-on-yellow perimetry (8.58 +/- 3.96 dB) was significantly higher than that of white-on-white perimetry (3.52 +/- 2.69 dB; P <.0001, unpaired t test). That is, the change in mean deviation was greater in blue-on-yellow perimetry than in white-on-white perimetry by a factor of 2.4 times.
  
  
  CONCLUSIONS
  Cataract causes predominantly a general reduction of sensitivity in both blue-on-yellow and white-on-white perimetries, and the general reduction of blue-on-yellow sensitivity is far greater than that of white-on-white sensitivity.
authors.affiliation: Korea University College of Medicine, Seoul, South Korea.
authors.forename: Y Y
authors.initials: YY
authors.lastname: Kim
authors.forename: J S
authors.initials: JS
authors.lastname: Kim
authors.forename: D H
authors.initials: DH
authors.lastname: Shin
authors.forename: C
authors.initials: C
authors.lastname: Kim
authors.forename: H R
authors.initials: HR
authors.lastname: Jung
mesh_terms: D000328:Adult; D000368:Aged; D002386:Cataract / Q000150:complications / Q000503:physiopathology; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007908:Lens, Crystalline / Q000503:physiopathology; D008027:Light; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification; D014786:Vision Disorders / Q000209:etiology / Q000503:physiopathology; D014792:Visual Acuity; D058609:Visual Field Tests / Q000379:methods*; D014794:Visual Fields / Q000502:physiology*