Subjective visual vertical in patients with Usher syndrome - Université Paris Nanterre Access content directly
Journal Articles Journal of Vestibular Research Year : 2020

Subjective visual vertical in patients with Usher syndrome


BACKGROUND:Verticality, or more precisely the ability to perceive spatial orientation with regard to gravity, is based on the integration of visual, vestibular and somesthetic information. OBJECTIVE:The purpose of the present study was to compare the subjective visual vertical (SVV) in patients with Usher (type I and type II) with visual or vestibular impairment, and in healthy participants, in order to explore the importance of the visual and vestibular functions on the vertical’s perception. METHODS:We evaluated the SVV using a wall housing which projects on the opposite wall a red-light line of about 2 meters, obtained by laser cannon. The evaluation was carried out under two tilt conditions: clockwise and counter-clockwise randomly performed five times in each direction. The response to the SVV task was quantified by the mean of the absolute values of the SVV. RESULTS:Responses to the SVV were significantly less accurate in patients with Usher with respect to healthy participants while it was similar for the two groups of patients with Usher. CONCLUSIONS:We hypothesize that visual inputs play a very important role in the perception of verticality and that the symmetrical bilateral vestibular deficit in Usher type I does not have a strong impact in perception of verticality.
Fichier principal
Vignette du fichier
SVV_Usher_2020.pdf (184.89 Ko) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-03152760 , version 1 (25-02-2021)



Moetez Baghdadi, Simona Caldani, Audrey Maudoux, Isabelle A Audo, Maria Pia Bucci, et al.. Subjective visual vertical in patients with Usher syndrome. Journal of Vestibular Research, 2020, 30 (4), pp.275-282. ⟨10.3233/VES-200711⟩. ⟨hal-03152760⟩
110 View
167 Download



Gmail Mastodon Facebook X LinkedIn More