Subjective visual vertical in patients with Usher syndrome.
J Vestib Res
; 30(4): 275-282, 2020.
Article
in En
| MEDLINE
| ID: mdl-32925128
ABSTRACT
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.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Photic Stimulation
/
Space Perception
/
Usher Syndromes
/
Orientation, Spatial
Type of study:
Diagnostic_studies
Limits:
Adolescent
/
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Language:
En
Journal:
J Vestib Res
Journal subject:
OTORRINOLARINGOLOGIA
Year:
2020
Document type:
Article
Affiliation country:
Francia