Читать книгу Eye Tracking the User Experience - Aga Bojko - Страница 43

Monocular eye trackers record only one eye, while binocular systems record both eyes. Theoretically, monocular eye trackers should be sufficient because both eyes tend to move together, so by looking at the position of one eye, you can also determine the position of the other eye. Monocular systems are usually also more affordable than binocular ones.

However, UX research can benefit from binocular eye tracking in a few ways. First, binocular tracking increases accuracy and precision due to the averaging of the data from both eyes. Second, if one eye temporarily loses tracking (perhaps due to the participant moving a little outside of the head box), information doesn’t get lost because there are always data from the other eye. Finally, knowing the position of both eyes helps correct the parallax error in wearable eye trackers.