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vestibulo-ocular reflex; sinusoidal vertical axis rotational testing
Indications:
- balance disorder
- assessment of accidental falls
- falls in the elderly
Clinical significance:
- test of neural mechanism that keeps a visual image registered on the fovea during head movement
- evaluates the 3 components of the vestibulo-ocular reflex
a) labyrinth
b) vestibular nuclei in the brain stem
c) higher central vestibular connections
Procedure:
- the patient shakes his/her head 'no' & 'yes' while wearing electrodes that monitor eye position & a small angular velocity sensor that measures head velocity
- 3 characteristics of the vestibulo-ocular reflex are computed
a) gain (ratio of eye velocity to head velocity)
b) phase (degrees by which the eye misses the target)
c) asymmetry (comparing gain moving right with gain moving left)
General
clinical procedure
reflex
References
- Balance+Plus System
http://balance-plus.com/bp-coding.html