4.5
Calibrate the Patient
The horizontal channel should always be calibrated if possible. The vertical channel is more difficult for patients, and it is
acceptable to use F3 Default Calibration. To perform an individual eyes calibration, select an individual eyes protocol.
A. Make sure the light bar is positioned properly (horizontally or vertically) and the patient is 4 feet (1.2 m) from the bar.
B. Select a protocol on the
New Test
tab on the Main Menu.
C. Click
F5 Calibrate
to access the calibration mode. (Ask the patient to follow the dot of light on the light bar without
moving his/her head.) The targets are ±10°. They do not extend to the end of the light bar.
D. If using Monocular VNG, click
F9 Switch Eye
to select the eye to be tested. The eye that is grayed out is the cur-
rently selected eye.
Main Window, Calibration Mode, Monocular VNG
1. Click
F9 Switch Eye
to change
the selected eye.
2. View selected protocol and selec-
ted eye (
A
).
E. Click
F12 Start
. The system automatically adjusts the gain and offset of the eye signal to match the target. When the
two tracings match (in size), press
F12 Accept
and allow 2 to 3 more cycles to run to verify the accuracy of the cal-
ibration.
Calibration Waveforms
Accept Calibration Marker (A)
VNG Note
: The Video Eye Display dialog
will display
Otometrics - ICS Chartr 200 VNG/ENG
23
4 Collect Patient Data
Summary of Contents for Otometrics ICS Chartr 200 VNG/ENG
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