title: A sweep VEP test for color vision deficits in infants and young children.
abstract: OBJECTIVE
  Color vision testing in young children typically is precluded by the motor and cognitive skills required by standard tests; yet this information can be useful for diagnosis and counseling in many conditions. The purpose of this study is to evaluate a visual evoked potential (VEP) method for assessing red-green color vision anomalies in pediatric patients.
  
  
  METHODS
  The relative chromatic luminance (C = R/R + G) of a rapidly reversing red-green checkerboard was varied across a wide range within a short viewing period (10 sec). Swept-parameter VEP methods were used to measure the cortical response to the range of C presented.
  
  
  RESULTS
  Individuals with normal color vision exhibit a VEP response that exceeds noise levels across all values of C, often with an amplitude minima near the photopic equiluminant point (C = 0.5). Results from children with established protan and deutan color vision anomalies show loss of VEP amplitude and phase at values of C consistent with the respective color defect. A patient with achromatopsia showed a generalized depression of VEP response across all values of C tested.
  
  
  CONCLUSIONS
  Color sweep VEP techniques appear promising for the clinical assessment of color status in pediatric patients.
authors.affiliation: Department of Ophthalmology and Visual Science, University of Wisconsin, Madison 53705, USA.
authors.forename: J N
authors.initials: JN
authors.lastname: Ver Hoeve
authors.forename: T D
authors.initials: TD
authors.lastname: France
authors.forename: G A
authors.initials: GA
authors.lastname: Bousch
mesh_terms: D002648:Child; D002675:Child, Preschool; D003119:Color Perception Tests / Q000379:methods*; D003117:Color Vision Defects / Q000175:diagnosis* / Q000503:physiopathology; D004569:Electroencephalography; D005074:Evoked Potentials, Visual; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D011237:Predictive Value of Tests