What makes our eye trackers unique
There are certain things that set Tobii Dynavox eye trackers apart from others.
You can move your head freely
Tobii eye trackers use a unique and very accurate 3D model of a human eye. This model holds information about the physical shape of an eye and how light is reflected and refracted, among other things. With this model you don’t need to keep your head still when using a Tobii eye tracker, in fact you can move your head freely without any significant loss of precision or accuracy. This is particularly beneficial for individuals with uncontrolled head movement, such as those with Cerebral Palsy or individuals with ALS who might adjust their position throughout the day.
Works for more or less everyone
For accurate eye tracking, the eye tracker needs to find your pupils*. This can be done through either bright or dark pupil tracking. Bright pupil tracking works similarly to when you get red eyes when using a compact camera with a flash. By placing the flash, or in this case the illuminators, farther away from the lens you can avoid this. This is dark pupil tracking.
Some people track better with dark pupil tracking, others with bright pupil tracking. Factors like pupil size, age and environmental lights affect how well you are tracked using either of the two methods.
Tobii Dynavox eye trackers are unique in that they dynamically switch between bright and dark pupil tracking, so you will always have an optimized eye tracking experience.
*It is actually the relationship between the pupils and the glints, or reflections, that help the eye tracker determine where you are looking.