title: Contrast sensitivity measurement with 2 contrast sensitivity tests in normal eyes and eyes with cataract.
abstract: OBJECTIVE
  To assess the reliability of and correlation between 2 contrast sensitivity tests in normal eyes and eyes with cataract.
  
  
  METHODS
  Department of Ophthalmology, Yonsei University Hospital, Seoul, Korea.
  
  
  METHODS
  The Vision Contrast Test System (wall-chart test) and Optec 6500 system (view-in test) were used to measure contrast sensitivity in normal eyes at 2 visits separated by 2 weeks and in eyes with cataract before and 2 months after cataract surgery. The test-retest reliability and correlation were calculated by the intraclass correlation coefficient (ICC), coefficient of repeatability (COR), and 95% range of difference using the Bland-Altman method.
  
  
  RESULTS
  The study evaluated 40 normal eyes of 20 subjects and 44 eyes of 38 cataract patients. The repeatability of the 2 test methods was generally acceptable. The view-in test performed better than the wall-chart test in the ICC analysis (0.85 versus 0.65) but not in the COR analysis (+/-0.20 log versus +/-0.27 log). Correlation between the 2 tests was poor in both groups of eyes. The ceiling effect was greater with the wall-chart test. The floor effect occurred mainly in patients with cataract, in which it was greater preoperatively than postoperatively; at high frequency; and with the view-in test.
  
  
  CONCLUSIONS
  Based on the ceiling and floor effect, the view-in test is better for detecting subtle contrast sensitivity changes in normal or near-normal eyes and the wall-chart test is useful in eyes with compromised vision.
  
  
  BACKGROUND
  No author has a financial or proprietary interest in any material or method mentioned.
authors.affiliation: Department of Ophthalmology, Yonsei University College of Medicine, Institute of Vision Research, Seoul, Korea.
authors.forename: Young Taek
authors.initials: YT
authors.lastname: Hong
authors.forename: Sang Woo
authors.initials: SW
authors.lastname: Kim
authors.forename: Eung Kweon
authors.initials: EK
authors.lastname: Kim
authors.forename: Tae-im
authors.initials: TI
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002386:Cataract / Q000503:physiopathology*; D015350:Contrast Sensitivity / Q000502:physiology*; D006801:Humans; D019654:Lens Implantation, Intraocular; D008875:Middle Aged; D018918:Phacoemulsification; D012016:Reference Values; D015203:Reproducibility of Results; D014787:Vision Tests / Q000379:methods*; D014792:Visual Acuity / Q000502:physiology