Pupil detection ensures that the system tracks the pupil properly during calibration and when collecting data.
Note• When Image Display is set to Pupil Location, make additional adjustments to remove any white areas outside
the white circular image of the pupil.
8. Select OK to accept the ROI position.
9. Continue to Calibration ► 48.
9.2.2 LARP or RALP test
Note• It is recommended to do the Lateral test prior to doing either the LARP or RALP test. Calibration must be per-
formed with Lateral test type selected.
This procedure assumes that the test is performed after the Lateral test.
1. Choose the Impulse Type: LARP or RALP. Choosing the impulse type determines which plane of the gyroscopes (i.e.,
head trace) should be bold in the Real Time Trace. It also determines the shape of the training curves.
2. For patients with spontaneous nystagmus or gaze-evoked nystagmus (evoked by gaze position during head impulse),
select the check box Spontaneous Nystagmus. By selecting this check box for a patient who has spontaneous nys-
tagmus or gaze-evoked nystagmus, it prevents good impulses from being rejected inappropriately.
Note• Clicking Center sets the reference point used to provide feedback for head position during testing. The button
is disabled if Head Position Feedback is not selected in the Test Options. For information about changing settings,
please refer to Options in the Reference Manual.
3. Ensure that the patient's head is not moving and that it is perfectly centered. Click Center or press the left button on
the presentation remote.
46 Otometrics - ICS Impulse USB
9 Head Impulse
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