How Tobii Dynavox Eye Tracking Works?

Tobii eye tracker uses Near Infra-red light to illuminate the eyes. From there, two extremely high quality camera sensors capture the reflection off of the retina and the cornea of the eyes, commonly referred to as “red eye” and the glint, respectively. The eye tracker then uses these two points to build a 3D model of the user’s eyes to determine two things: where the user is looking (gaze point) and where the user’s eyes are in space, relative to the location of the computer (track box).

This information is then paired with Tobii Windows Control to allow the computer to know exactly where the user is looking with an accuracy of 1cm. The computer can then track the user’s gaze point and, ultimately, tell the computer where their eyes are looking at all times. By knowing where the user’s eyes are looking, the eye tracking device then can control the computer, similar to the way a mouse lets you control it with your hand.

Gaze interaction is a computer access method that allows those with disabilities to navigate and control their computer with their eyes, similarly as an everyday computer user uses a mouse (e.g., activate, select, zoom, scroll, etc.) to control their computer. Gaze interaction only requires the movement of the eye itself—the movement of other muscles is not required, making it a perfect solution for those with rehabilitative disabilities (paralysis, spinal cord injury, repetitive strain injury, severe carpal tunnel) and motor disabilities (Lou Gehrig’s, cerebral palsy, autism, etc.).

Tobii Windows Control provides a more natural, efficient and precise computer interaction method, superior to any other computer control device used today.

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