Running head: VIDEO-OCULOGRAPHY
Video-oculography refers to the method of recording the movement of the eye movement
using digital video cameras. Before the video-oculography method was discovered, it is the
electro-nystagmography method that was widely used for this process, which involved the use of
corneal retinal potential, the battery-like effect of the eye (Cerrolaza, 2008). The positive and
negative discharge of the corneal retinal potential is recorded during the up and down, and side
to side movement of the eye. However, the VOG technology utilizes infrared cameras for
measuring the position of the eye. It involves mounting small cameras in goggles and tracking
the pupil’s center in order to obtain the precise location of the eye.
Clinicians have been dependent on the electro-nystagmography or ENG, for so many
years, in the evaluation of central and peripheral vestibular functions. There is no doubt that the
technology, ENG, still remains to be the fundamental test for identifying and diagnosing the
unilateral vestibular dysfunction or UVDs (Kiderman, 2010). However, it has considerable
limitations in the recording and observation of torsional nystagmus. Another disadvantage that is
associated with ENG is that most of its tests require the patients to close their eyes, because it
may otherwise affect the eye. Therefore, for all this time before VOG emerged, clinicians have
relied upon graphic recordings that are unidimensional, and could only speculate about what
movements were made by the eyes beneath the closed eyelids (Van der Geest, 2002).
Over the past 10 years, microprocessor-based software algorithms and ENG have been
introduced, and have provided essential advances in the tests for vestibular function. Similarly,
head rotation tests, active and passive, for instance, the rotary chair and the vestibular
autorotation test or VAT, have significantly ena...