Tobii Screen Positioning

What to do if Tobii is behaving poorly

  • Turn off top light Eye drops
  • Press C and reposition Tobii if misaligned Press A if Tobii is aligned to update calibration Restart Tobii (an advanced function)
  • Do not wait for guidance from the user because he cannot communicate if Tobii is not positioned.
dfPositioning Tobii: Key Points

 

Every time the user changes position, the tobii screen must be repositioned. First, press C to track eyes.

You must view from side and from user position to ensure screen is parallel to and centered on
the user's face.

Tracked eyes (white dots) should be centered in black area (or a bit lower) and aligned with horizontal lines on the screen.

Distance triangle should be in middle of green zone (or a bit higher)

Press A to calibrate only after Tobii is positioned and tracking is poor. Otherwise, useless.

eePositioning Tobii: Detailed Steps

 

Use whenever the user is moved, eye tracking quality is poor, and intermittently since the user position will shift over time. The user is not able to communicate or answer your questions unless the screen is in the correct position.

1. Turn off top lights to improve eye detection. Turn off side lights if user lying on side.

2. Press C on right side of Tobii to display eye tracking. White dots are the user eyes. They are present only when the eyes are open and visible to the Tobii camera.

3. Rough positioning:

  • Center and align screen to front of face roughly
  • Move screen closer/farther from face using the eye tracker triangle, so triangle is middle of green zone or slightly higher (closer).

 

 

 

4. Look directly from side and adjust:
You may need to crouch down to get direct view if head is low or if user is lying on side.

  • Check that eyes and face centered on screen. To correct move screen up/ down.
  • Check face is parallel to screen. To correct tilt screen up/ down

 

5. Look directly from behind screen or user point of view, and adjust:

  • Look at user over top of screen, or look at screen with your head directly over patient head.
  • Check that eyes and face centered on screen. To correct move screen left/right.

 

6. Look directly from top and adjust:

  • You may need to stand over patient. This may not be practical.
  • Check that eyes and face centered on screen. To correct move screen left/right.
  • Check face is parallel to screen. To correct tilt screen left/right.




7.  Fine-Tune Rotation. Turn screen like steering wheel so that tracked eyes are horizontal on screen.




 

9.Repeat steps as needed to achieve the "Ideal Tobii Position" (see Page 1).

10.If Tobii performance is poor, recheck Tobii position and repeat steps as needed.

11.If the change in screen position was very large, if performance is persistently poor, or if user prompts you, Press A to re-calibrate the Tobii.

 

  • a.If calibration is very poor, the user will not be able to communicate or operate any Tobii functions. You will need to perform all Tobii functions.
  • b.After you press A, wait while the user's eyes follow orange/black dots on screen.
  • c.If the results are bad (red) when displayed:
    i. If many of the white circles have a large scatter of lines over them, then press "Recalibrate".
    ii. If only a few white circles have a large scatter of line, or if one or more circles have no line or dot over them, then selected those circle by touching them. A circle is selected when a box appears around it. Select "Recalibrate" to start the calibration procedure.
  • d.Repeat until the calibration is acceptable (yellow or green), and then press Ok.