title: Repeatability of contrast sensitivity testing in patients with age-related macular degeneration, glaucoma, and cataract.
abstract: To analyze the intrasession and intersession repeatability of contrast sensitivity (CS) measurements in patients with glaucoma, cataract, or age-related macular degeneration (AMD) and healthy controls.
  CS measurements were performed using the OPTEC-Functional Vision Analyzer (FVA), which uses a standardized and closed (view-in) system. Measurements for patients with glaucoma, cataract, or AMD and healthy controls were repeated within 30 minutes (intrasession) and during two sessions (intersession), separated by one week to one month. Test-retest reliability and correlation were measured using the intraclass correlation coefficient (ICC) and coefficient of repeatability (COR).
  Ninety subjects (90 eyes) with visual acuity of 0.17 logMAR or higher in the cataract group or 0.00 logMAR in the other groups were included. During the first session, the ICC values were 0.87, 0.90, 0.76, and 0.69, and COR values were 0.24, 0.20, 0.38, and 0.25 for the control, glaucoma, cataract, and AMD groups, respectively. The reliability scores significantly improved during the second session, except in the glaucoma group. There was an acceptable floor effect and no ceiling effect at higher frequencies in the glaucoma and AMD groups.
  In subjects with good visual acuity, the FVA system is useful for evaluating CS and demonstrates good repeatability, as shown by ICC and COR. Because there is no ceiling effect, this system is beneficial for evaluation of early changes in CS, particularly in patients with glaucoma or AMD.
authors.affiliation: Department of Ophthalmology, Faculty of Medicine, Canakkale Onsekiz Mart University, Canakkale, Turkey.
authors.forename: Selcuk
authors.initials: S
authors.lastname: Kara
authors.affiliation: Department of Ophthalmology, Faculty of Medicine, Canakkale Onsekiz Mart University, Canakkale, Turkey.
authors.forename: Baran
authors.initials: B
authors.lastname: Gencer
authors.affiliation: Department of Ophthalmology, Faculty of Medicine, Canakkale Onsekiz Mart University, Canakkale, Turkey.
authors.forename: Ismail
authors.initials: I
authors.lastname: Ersan
authors.affiliation: Department of Ophthalmology, Faculty of Medicine, Canakkale Onsekiz Mart University, Canakkale, Turkey.
authors.forename: Sedat
authors.initials: S
authors.lastname: Arikan
authors.affiliation: Department of Ophthalmology, Faculty of Medicine, Canakkale Onsekiz Mart University, Canakkale, Turkey.
authors.forename: Omer
authors.initials: O
authors.lastname: Kocabiyik
authors.affiliation: Department of Ophthalmology, Faculty of Medicine, Canakkale Onsekiz Mart University, Canakkale, Turkey.
authors.forename: Hasan Ali
authors.initials: HA
authors.lastname: Tufan
authors.affiliation: Department of Ophthalmology, Faculty of Medicine, Canakkale Onsekiz Mart University, Canakkale, Turkey.
authors.forename: ArzuTaskiran
authors.initials: A
authors.lastname: Comez
mesh_terms: D000328:Adult; D000367:Age Factors; D016022:Case-Control Studies; D002386:Cataract / Q000175:diagnosis / Q000503:physiopathology*; D015350:Contrast Sensitivity / Q000502:physiology*; D005260:Female; D005901:Glaucoma / Q000175:diagnosis / Q000503:physiopathology*; D006801:Humans; D008268:Macular Degeneration / Q000175:diagnosis / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012016:Reference Values; D015203:Reproducibility of Results; D018709:Statistics, Nonparametric; D013997:Time Factors; D014787:Vision Tests / Q000295:instrumentation / Q000379:methods