User's Manual

This means that for those users leaning sideways or those lying down the Tobii Dynavox I-Series also needs to be tilted in
order to keep the users eyes parallel to the screen and at the optimal distance, see Figure 5.2 Positioning when Users
Leaning Sideways or Those Lying Down, page 24.
Make sure the user is placed comfortably in relation to the optimal positioning of, and distance from, the unit. Be
aware also that the user’s comfort, as well as the Eye Gaze performance, will be enhanced if the sun is not shin-
ing directly on the screen or into the user’s eyes.
The user should be positioned at the optimal distance to allow for the best possible Eye Gaze.
5.3.2 Track Box
The Tobii Dynavox I-Series allows for extensive Freedom of Head Movement. Once the Tobii Dynavox I-Series is properly
calibrated and placed in front of the user, no further adjustments are required.
The Tobii Dynavox I-Series produces an industry leading sized track box with the approximate dimensions of 30 cm × 20
cm × 20 cm / 11.8 in × 7.9 in × 7.9 in (Width × Height × Depth). The Track Box is an invisible box positioned approximately
60 cm (23.5 in) straight out from a point just above the middle of the screen.
At 70 cm (27.5 in) the Tobii Dynavox I-Series allows for lateral Freedom of Head Movement in an area of about 50 × 36 cm
(20 × 14 in) or 35 × 30 cm (13,8 × 11,8 in) depending on which Eye tracker the Tobii Dynavox I-Series is equipt with. For
more information, see Appendix D Technical Specifications, page 51.
In order to function properly for Eye Gaze the user needs at least one eye in the track box at all times.
5.3.3 Track Status
The Track Status function is used to check if the user is correctly positioned in front of the eye tracker.
● The two (2) white dots — The users eyes and how they are positioned towards the screen. For optimal position, the
white dots should be in the middle of the black area.
● The color full bar on the left with the white arrow — How far or close the user is positioned from the screen.
– If the white arrow is in the middle of the green area of the bar, the user is at the optimal distance from the
screen.
– If the arrow is on the lower part of the bar — move the user closer.
– If the arrow is on the upper part of the bar — move the user further away from the bar.
#12004244 Tobii Dynavox I-Series User’s manual v. - en-US
5 Using the Tobii Dynavox I-Series
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