Age- and frequency-dependent changes in dynamic contrast perception in visual snow syndrome

Autor: Ozan E. Eren, Andreas Straube, Florian Schöberl, Ruth Ruscheweyh, Thomas Eggert, Christoph J. Schankin
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: The Journal of Headache and Pain, Vol 22, Iss 1, Pp 1-8 (2021)
Druh dokumentu: article
ISSN: 1129-2369
1129-2377
DOI: 10.1186/s10194-021-01355-y
Popis: Abstract Objective Patients with visual snow syndrome (VSS) suffer from a debilitating continuous (“TV noise-like”) visual disturbance. They report problems with vision at night and palinopsia despite normal visual acuity. The underlying pathophysiology of VSS is largely unknown. Currently, it is a clinical diagnosis based on the patient’s history, an objective test is not available. Here, we tested the hypothesis that patients with VSS have an increased threshold for detecting visual contrasts at particular temporal frequencies by measuring dynamic contrast detection-thresholds. Methods Twenty patients with VSS were compared to age-, gender-, migraine- and aura-matched controls in this case-control study. Subjects were shown bars randomly tilted to the left or right, flickering at six different frequencies (15 Hz, 20 Hz, 25 Hz, 30 Hz, 35 Hz, 40 Hz). The contrast threshold (CT) for detection of left or right tilt was measured in a two-alternative adaptive forced-choice procedure (QUEST). The threshold was defined as the Michelson contrast necessary to achieve the correct response in 75% of the cases. Results The CT increased for higher flicker frequencies (ANOVA: main effect frequency: F (5,180) = 942; p
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