title: Reliability in perimetric multichannel contrast sensitivity measurements.
abstract: BACKGROUND
  In this study, the reliability of perimetric contrast sensitivity measurements favouring the achromatic, the red-green and the blue-yellow post-receptorial mechanisms was analysed.
  
  
  METHODS
  A new technique, multichannel ATD perimetry, provides spatial and temporal stimuli favouring the detection by an achromatic mechanism (A), from a magno or parvocellular origin or by a red-green (RG) chromatic mechanism, with a parvocellular origin or a blue-yellow (BY) mechanism, with a koniocellular origin. The repeatability and reproducibility of contrast sensitivity measurements with these stimuli were studied in a group of 40 healthy subjects. The analysis was carried out on 21 testing points within a 60° by 40° fovea-centred region of the visual field.
  
  
  RESULTS
  The within-observer repeatability for the four mechanisms studied is either good or excellent when the intra-class correlation coefficient (ICC) can be calculated. For the remaining points, the Friedman's test finds that the measurements are repeatable. The between-observer reproducibility was either excellent or good in cases where the ICC was applied and according to the Friedman's test all results were reproducible.
  
  
  CONCLUSIONS
  The results obtained showed good repeatability and reproducibility with A, RG and BY stimuli, although with BY stimuli repeatability is slightly worse. Future studies on the diagnostic validity of this device are based on the fact that changes of sensitivity can be compared by means of a visual single task, contrast sensitivity measurement and using a common metric.
authors.affiliation: Dpto. Óptica, Farmacología y Anatomía, Universidad de Alicante, Alicante, Spain. dolores.fez@ua.es.
authors.forename: Dolores
authors.initials: D
authors.lastname: de Fez
authors.forename: Pascual
authors.initials: P
authors.lastname: Capilla
authors.forename: Vicente
authors.initials: V
authors.lastname: Camps
authors.forename: M José
authors.initials: MJ
authors.lastname: Luque
authors.forename: Vicenta
authors.initials: V
authors.lastname: Moncho
mesh_terms: D000328:Adult; D015350:Contrast Sensitivity / Q000502:physiology*; D005260:Female; D005584:Fovea Centralis / Q000502:physiology; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D012372:ROC Curve; D015203:Reproducibility of Results; D058609:Visual Field Tests / Q000379:methods*; D014794:Visual Fields / Q000502:physiology*; D055815:Young Adult
keywords: agreement; contrast sensitivity; multichannel perimetry; repeatability; reproducibility