title: Reproducibility of morphoscopic contrast sensitivity testing with the Visual Capacity Analyzer.
abstract: OBJECTIVE
  To determine the reproducibility of morphoscopic contrast sensitivity test values in healthy subjects using the Visual Capacity Analyzer (VCA) (L2 Informatique).
  
  
  METHODS
  Institute of Vision Research, Department of Ophthalmology, Yong-Dong Severance Hospital, Yonsei University, Seoul, South Korea.
  
  
  METHODS
  Five healthy volunteers were recruited for this study. With the VCA, 1 eye of each person was tested with different sized letters displayed on a computer screen at 11 spatial frequencies ranging from low (3.0 cycles/deg [cpd]) to high (30.0 cpd). The measurement was repeated 5 times under 2 screen luminance levels (maximum and 3 cd/m2).
  
  
  RESULTS
  Under maximum luminance background, the coefficient of variation (CV) and reliability coefficient (RC) at the spatial frequencies examined ranged from 4.3% to 35.0% and 89.1% to 99.8%, respectively. Under a screen luminance of 3 cd/m2, the CV ranged from 0.5% to 15.9% and the RC, from 97.5% to 100.0%.
  
  
  CONCLUSIONS
  At the spatial frequencies examined, morphoscopic contrast sensitivity testing using the VCA had a high level of reproducibility and may be useful in measuring a patient's visual function in the actual environment.
authors.affiliation: Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, South Korea.
authors.forename: Hyung Kuen
authors.initials: HK
authors.lastname: Lee
authors.forename: Il Hwan
authors.initials: IH
authors.lastname: Koh
authors.forename: Chul Myong
authors.initials: CM
authors.lastname: Choe
authors.forename: Chan Yoon
authors.initials: CY
authors.lastname: Kim
authors.forename: Young Jae
authors.initials: YJ
authors.lastname: Hong
authors.forename: Gong Je
authors.initials: GJ
authors.lastname: Seong
mesh_terms: D000328:Adult; D015350:Contrast Sensitivity; D003936:Diagnosis, Computer-Assisted / Q000592:standards; D005260:Female; D006801:Humans; D008297:Male; D012016:Reference Values; D015203:Reproducibility of Results; D014787:Vision Tests / Q000295:instrumentation / Q000592:standards