Additional Nexus reference PDFs:

Nexus legacy documentation:

This information is for Vicon Nexus 2.13. For up-to-date help, see the latest Nexus documentation.

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The Dikablis Eye Tracker enables you to track movement of the eye's pupil to calculate the gaze vector. Its node is displayed under the Devices node when Vicon Nexus is connected to a Vicon system that includes at least one Dikablis Eye Tracker.

The Dikablis Eye Tracking system is compatible with current Vicon cameras. A minimum of two cameras are required for use with the system.

For information on setting up a Vicon system that includes Dikablis Eye Tracker, see Eye tracking with Vicon Nexus.

Dikablis Eye Tracker node context menu

The following command is available from the context menu that is displayed when you right-click on a Dikablis Eye Tracker node in the Resources tree on the System tab:

Remove DeviceRemoves the Dikablis Eye Tracker node from the System Resources tree.

Dikablis Eye Tracker node properties

You can configure the following settings in the Properties pane for a Dikablis Eye Tracker. For instructions on setting up the hardware, see the Dikablis Eye Tracker User Manual.

General section

NameA user-defined display name for the device.
Default: Blank
Delay Compensation (s)The delay compensation value (in seconds).
Many eye tracking systems, particularly new wireless systems, may introduce a small delay in transmission of data. This delay may cause a misalignment between Vicon frames of data and eye tracking frames of data. The Delayed Compensation slider bar enables you to correct this difference and properly align Vicon data with eye tracking data. To find the amount of delay for an eye tracking system, refer to the operating manual of the eye tracking system.
All devices have a delay compensation value which adjusts the synchronization offset between the device and the Vicon data. Analog data collected with the Vicon connectivity devices should already be synchronized, so this value should be set at 0. Values can be set between -10 and 10.
Default: 0
Head SegmentEnter or navigate to the name of the segment that contains the eye.

Connection section

IP AddressEnter the same IP address that has been set in the Dikablis Recorder software.
Port NumberThe port number for connecting the Dikablis Recorder on the Dikablis laptop. Normally, leave this number at its default value (2002).

Eye Offset section

To find the relevant eye offset values, if your Vicon system includes video cameras, you can use overlay video. If not, you can measure the distance from the origin marker.

xEnter the X-coordinate of the eye in the head segment coordinate frame (the distance between the origin marker and the eye (in mm)
yEnter the Y-coordinate of the eye in the head segment coordinate frame (the distance between the origin marker and the eye (in mm)
zEnter the Z-coordinate of the eye in the head segment coordinate frame (the distance between the origin marker and the eye (in mm)

Calibration section

Calibration ObjectEnter the name of the calibration device (normally Wand)
ResetClears the current calibration
AddAdd a point to the current calibration.
RemoveUndoes the last Add operation
SamplesThe number of points used in the current calibration
ResidualEstimated residual accuracy value. Calculated as the average reprojection error in eye tracker pixels.