title: [Frankfurt-Freiburg Contrast and Acuity Test System (FF-CATS). A new test to determine contrast sensitivity under variable ambient and glare luminance levels].
abstract: BACKGROUND
  The purpose of the present study was to evaluate a computerized test for measurement of contrast sensitivity thresholds under variable ambient and glare luminance levels.
  
  
  METHODS
  A total of 40 eyes of 40 healthy subjects were examined with the FF-CATS and the Functional Acuity Contrast Test (FACT) at 0.167 cd/m(-2) (mesopic) and 167 cd/m(-2) (photopic). Measurements were performed twice with and without glare in a randomized fashion. Tests were evaluated according to three criteria: (1) repeatability, (2) discriminative ability, and (3) validity.
  
  
  RESULTS
  The FF-CATS showed a higher discriminative ability between the two groups compared to the FACT charts. Under photopic conditions, the COR value was 0.39 for the FF-CATS and 0.26 for the FACT charts; under mesopic illumination, the COR value for the FF-CATS was 0.46 and 0.36 for the FACT charts.
  
  
  CONCLUSIONS
  The FF-CATS is a reliable, sensitive, valid, and flexible test system for the determination of visual acuity and contrast sensitivity thresholds under variable ambient and glare luminance conditions.
authors.affiliation: Klinik für Augenheilkunde, Johann Wolfgang Goethe-Universität, Frankfurt am Main.
authors.forename: E
authors.initials: E
authors.lastname: Terzi
authors.forename: J
authors.initials: J
authors.lastname: Bühren
authors.forename: W
authors.initials: W
authors.lastname: Wesemann
authors.forename: T
authors.initials: T
authors.lastname: Kohnen
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D015350:Contrast Sensitivity; D003627:Data Interpretation, Statistical; D019466:Glare; D006801:Humans; D008875:Middle Aged; D011446:Prospective Studies; D012372:ROC Curve; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012684:Sensory Thresholds; D014787:Vision Tests / Q000295:instrumentation / Q000379:methods; D014792:Visual Acuity; D014796:Visual Perception