title: Chromatic-achromatic perimetry in four clinic cases: Glaucoma and diabetes.
abstract: BACKGROUND
  Some diseases that affect the visual system may show loss of chromatic-achromatic sensitivity before obvious physical signs appear in the usual examination of the eye's posterior segment. A perimetric study has been conducted with four typical patients with glaucoma and diabetes, at different stages of the disease.
  
  
  METHODS
  In addition to the standard white-on-white (standard automated perimetry [SAP]), a test battery has been used to study patient's contrast sensitivity, using stimuli with different chromatic, spatial, and temporal content (multichannel perimetry). The choice of stimuli tries to maximize the response of different visual mechanisms: Achromatic (parvocellular and magnocellular origin); chromatic red-green (parvocellular origin); and chromatic blue-yellow (koniocellular origin).
  
  
  RESULTS
  The results seem to indicate losses in the achromatic-parvocellular perimetry and both chromatic perimetry tests, undetected by conventional SAP.
  
  
  CONCLUSIONS
  Our results illustrate that our patients without visible retinal alterations show signs of suspicion in multichannel perimetry.
authors.forename: Inmaculada
authors.initials: I
authors.lastname: Cabezos
authors.forename: Maria Jos
authors.initials: MJ
authors.lastname: Luque
authors.affiliation: Department of Optics, Pharmacology and Anatomy, University of Alicante, Alicante, Spain.
authors.forename: Dolores
authors.initials: D
authors.lastname: de Fez
authors.forename: Vicenta
authors.initials: V
authors.lastname: Moncho
authors.forename: Vicente
authors.initials: V
authors.lastname: Camps
mesh_terms: D000328:Adult; D015350:Contrast Sensitivity; D003924:Diabetes Mellitus, Type 2 / Q000150:complications* / Q000503:physiopathology; D005260:Female; D005901:Glaucoma / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D058609:Visual Field Tests / Q000379:methods*; D014794:Visual Fields
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