Programm                 "Degeneration und Regeneration– Grundlagen, Diagnostik und Therapie"


Hotelbuchung
   Hotel Registration
Grußwort
   Welcome address
Beteiligte Gesellschaften
   Societies involved
DOG Information
   DOG Information
Eröffnung des Kongresses
   Opening Ceremony
Preise
   Awards
Ablauf der Tagung 2003
   General overview of congress
Lageplan der Räumlichkeiten
   Map of Congress Center
Wissenschaftliche Themen
   Scientific topics
Symposien
   Symposia
Wissenschaftliches Programm
   Scientific program
Posterpräsentationen
   Poster Presentation
Kurse
   Courses
Begleitende Veranstaltungen
   Accompanying program
Arbeitssitzungen
   Working sessions
Rahmenprogramm
   Social program
Allgemeine Informationen
   General Information
Autorenindex
   Index of Authors
Industrieaussteller
   Commercial exhibitors
Sponsoren
   Sponsors
Impressum



DOG Homepage


Abstract
Abstract

The Frankfurt-Freiburg Contrast and Acuity Test System (FF-CATS): A New Test to Determine Contrast Sensitivity at Different Luminance Levels with and without Glare

Terzi E.1, Bühren J.1, Bach M.2, Wesemann W.3, Kohnen T.1
1Dept. of Ophthalmology, University of Frankfurt/Main; 2Dept. of Ophthalmology, University of Freiburg; 3College of Optometry (HFAK), Cologne

Purpose: To evaluate a newly designed computer-based test system for the measurement of contrast thresholds at different luminance levels with and without glare.
Method: The FF-CATS is a psychophysical test based on the Freiburg Visual Acuity Test (FVAT) using an 8-alternative forced choice and the best PEST (parameter estimation by sequential testing) algorithm to measure automatically and observer-independently acuity and contrast thresholds. Landolt rings of 100’ in diameter (Snellen equivalent 20/400) are displayed at different contrasts on a high resolution monitor at 167 cd/m-2. For testing at the scotopic luminance level (0.167 cd/m-2), a neutral filter with t=10-3 was used to reduce monitor luminance. 40 eyes of 40 volunteers (group I: 20 eyes, age 21-47 years; group II: 54-69 years) were examined with the FF-CATS and with the Functional Acuity Contrast Test (F.A.C.T.) at 0.167 cd/m-2 and 167 cd/m-2 and with the Pelli-Robson chart (PRC) at 100 cd/m-2. Tests were performed with and without glare in a randomized order. The whole test sequence was re


Zurück | Back