title: Correlation of relative afferent pupillary defect and estimated retinal ganglion cell loss.
abstract: BACKGROUND
  The relative afferent papillary defect (RAPD) is an important parameter for quantifying the loss of neuronal function in asymmetric optic nerve disease. We wanted to assess its correlation with retinal ganglion cell loss, estimated from visual field defects, using a recently described method.
  
  
  METHODS
  In 36 patients with unilateral optic nerve disease, the RAPD was measured using an automated, computerized infrared pupillometer. The percentage of ganglion cell loss was estimated with clear templates.
  
  
  RESULTS
  We found a highly significant correlation between the RAPD and estimated ganglion cell loss. The correlation was higher for Humphrey visual fields than for Goldmann visual fields measured with the 14e and 12e stimulus.
  
  
  CONCLUSIONS
  The RAPD correlates well with estimated retinal ganglion cell loss in optic nerve disease. Humphrey visual fields seem to reflect the ganglion cell loss better than Goldmann visual fields. The spatial distribution of pupillomotor retinal ganglion cells seems to be proportional to the distribution of light-sensitive ganglion cells projecting to the lateral geniculate nucleus.
authors.affiliation: Universitäts-Augenklinik, Freiburg, Germany. lagreze@aug.ukl.uni-freiburg.de
authors.forename: W D
authors.initials: WD
authors.lastname: Lagrèze
authors.forename: R H
authors.initials: RH
authors.lastname: Kardon
mesh_terms: D002452:Cell Count; D006801:Humans; D007091:Image Processing, Computer-Assisted; D009901:Optic Nerve Diseases / Q000150:complications / Q000473:pathology / Q000503:physiopathology*; D011681:Pupil Disorders / Q000209:etiology / Q000503:physiopathology*; D012165:Retinal Ganglion Cells / Q000473:pathology*; D058609:Visual Field Tests; D014794:Visual Fields