title: The detection of a relative afferent pupillary defect.
abstract: OBJECTIVE
  To describe a simple technique that detects a subtle relative afferent pupillary defect.
  
  
  METHODS
  Observational report.
  
  
  METHODS
  With the patient seated at a slit lamp and the slit illumination turned off, a transilluminator light is swung back and forth between the eyes. The examiner observes the direct pupil light response and the consensual light response under slit-lamp magnification.
  
  
  CONCLUSIONS
  Using slit-lamp magnification, the examiner may observe small amplitudes of pupillary movement in the evaluation of a relative afferent pupillary defect.
authors.affiliation: Scheie Eye Institute, Department of Ophthalmology, University of Pennsylvania, Philadelphia 19104, USA.
authors.forename: Carolyn
authors.initials: C
authors.lastname: Glazer-Hockstein
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Brucker
mesh_terms: D003941:Diagnostic Techniques, Ophthalmological; D006801:Humans; D008027:Light; D011680:Pupil / Q000528:radiation effects; D011681:Pupil Disorders / Q000175:diagnosis* / Q000503:physiopathology; D012025:Reflex, Pupillary / Q000502:physiology