tests: The children were instructed to count the points that appeared in the horizontal plane for 30 seconds at 1.00 Hz clockwise and counterclockwise, thus producing a nystagmus by the visual follow-up of the light points that moved from one side to the other.
The results included benign paroxysmal positional nystagmus (n=4), spontaneous nystagmus (n=42), position-induced nystagmus (n=41), optokinetic nystagmus
(n=41) and gaze-evoked nystagmus (n=41).
The scientists sought to investigate whether a reflexive, involuntary eye movement called torsional optokinetic nystagmus
(tOKN) occurs at the same time as blinking.
For example, optokinetic nystagmus
is an oculomotor response to minimise retinal slip provoked by large moving visual stimuli or the entire visual field.
* The vestibular examination included a Romberg test, gait and cerebellar tests, evaluation of spontaneous and semi-spontaneous nystagmus, the Dix-Hallpike maneuver for postural vertigo, pendulum eye-tracking, evaluation for optokinetic nystagmus
, torsion swing testing, and caloric testing employing the Hallpike two-temperature technique.