title: Reduced oscillatory potentials of the full-field electroretinogram of eyes with aphakic or pseudophakic cystoid macular edema.
abstract: OBJECTIVE
  To report reduced oscillatory potentials (OPs) in the full-field electroretinogram (ERG) of eyes with aphakic or pseudophakic cystoid macular edema (CME).
  
  
  METHODS
  Observational case series.
  
  
  METHODS
  Bright white flash full-field ERGs were recorded from 19 eyes of 19 patients (ages, 53-84 years) with aphakic or pseudophakic CME. Seven of the cases had uncomplicated phacoemulsification (PE) with implantation of a posterior chamber intraocular lens (PC-IOL) and 6 had posterior capsular rupture during phacoemulsification and aspiration with implantation of a PC-IOL. Four additional patients had uncomplicated intracapsular cataract extraction (ICCE), and 2 had secondary anterior chamber intraocular lens after ICCE. Their fellow eyes without CME served as controls. Cystoid macular edema was diagnosed as clinically significant by slit-lamp examination and by fluorescein angiography. The grading for severity of CME was based on the fluorescein angiography. The visual acuity ranged from 20/200 to 20/16.
  
  
  RESULTS
  There were no significant differences in the mean amplitudes and implicit times of the a-waves and b-waves between the affected eyes and the fellow eyes. The mean summed amplitude of the OPs was significantly reduced in the affected eyes (P =.0003, Wilcoxon signed rank test). This decrease was strongly correlated with visual acuity (r =.779, P <.0001). The mean implicit time of the first OP was significantly delayed in the affected eyes (P =.0089, Wilcoxon signed rank test).
  
  
  CONCLUSIONS
  Because the peripheral retina contributes more significantly to full-field ERGs than the macula, the reduced OP amplitudes of the full-field ERGs in eyes with aphakic or pseudophakic CME suggest a functional impairment not only in the macula but also throughout the retina.
authors.affiliation: Department of Ophthalmology, Nagoya University School of Medicine, Nagoya, Japan.
authors.forename: Hiroko
authors.initials: H
authors.lastname: Terasaki
authors.forename: Kensaku
authors.initials: K
authors.lastname: Miyake
authors.forename: Yozo
authors.initials: Y
authors.lastname: Miyake
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001036:Aphakia, Postcataract / Q000150:complications / Q000503:physiopathology*; D004596:Electroretinography; D005260:Female; D005451:Fluorescein Angiography; D006801:Humans; D019654:Lens Implantation, Intraocular; D008269:Macular Edema / Q000150:complications / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009991:Oscillometry; D018918:Phacoemulsification; D010775:Photic Stimulation; D019591:Pseudophakia / Q000150:complications / Q000503:physiopathology*; D012160:Retina / Q000502:physiology*; D014792:Visual Acuity