What is eye tracking usability?
Eye tracking allows you to uncover usability problems without disturbing natural user behavior. For example, it's worth conducting eye tracking to understand whether your form field design is optimized for quick scanning – users can scan the form and understand all required fields at a glance.
What is eye tracking in user research?
Eye tracking is, simply, the observation and recording of eye behaviour such as pupil dilation and movement. It has applications in many areas, including psychological research and packaging design, but with regards to screen-based media, it's primarily used by researchers to identify where users are looking.