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Figure 3.9-1 Chair in supine position for Dix-Hallpike with head support removed (Orion and System 2000)
3.9.1.4
Positional
This is a vision-denied test and the test can be performed on an examination table/reclining chair. If the
reclining chair is used for the test, install the head support on the chair (Orion and System 2000). Lock the
chair with the foot brake if using the System 2000 reclining chair. If applicable, leave the hook and loop
straps (Orion and System 2000) from the head support detached from the goggles because the patient's
head will be in different positions during this test. The seatbelt should be unfastened. While the operator
supports the weight of the chair, lower the chair and patient to a supine position (refer to
with each subtest, assisting the patient into each new head and body position as required. Use the RF
remote, foot pedal, or side switch to begin recording after moving the patient's head or body into each
position. When testing is complete, have the patient return to laying on his / her back, then push down on the
chair recline lever and physically lift the chair back with the patient into an upright position.
Figure 3.9-2 Supine positional test
3.9.1.5
Caloric test
Caloric testing is performed with the goggle cover on for vision-denied testing.
Note: The caloric test works without a rotational chair. The patient needs to be in a reclined position with the
head inclined 30 degrees for the vestibular organ to be in the correct plane for stimulation through caloric
irrigation.
When the caloric test is selected, VisualEyes™ will initialize the irrigator for the selected warm or cool
temperature. The irrigator status will be displayed in the left menu panel. When the appropriate temperature
has been reached, the status will change to 'Ready' and a beep will sound to alert the user. To begin
recording, press the button on the AirFx or AquaStim irrigator handle. To abort the test, hold down the button
on the irrigator handle for three seconds. Alerting tasks should be administered during the caloric tests to
prevent the patient from suppressing the nystagmus.
A spontaneous nystagmus test can also be performed as a caloric subtest, which is recommended when
spontaneous nystagmus is present in the caloric position. When spontaneous nystagmus is detected, the
average SPV value can be used to correct the caloric summary by toggling the Spontaneous Correction
option in the left menu panel.
D-0134090-A – 2022/11
VisualEyes™ - Instructions for Use - EN
). Proceed
Figure 3.9-2
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