Pursuits is a technique that allows users to seamlessly interact with displays by using their eyes. What makes Pursuits particularly compelling is that it does not require users to calibrate with the eye tracker (standing still, looking at different points at the corners of a screen) before they interact. Pursuits is based on natural eye movements, and does not require them to have an additional device or learn a new technique. This key set of benefits enables truly spontaneous interactions.

Pursuits is based on a simple idea. When our eyes follow a moving object, they perfom a smooth movement called a smooth pursuit. We observed that during these movements the eyes reproduce the trajectory of the object they are following. By tracking a person's eye movements and the trajectory of a set of moving objects in real time, Pursuits can robustly recognize which object is being looked at. It correlates the eyes' trajectory with each object's trajectory.

Pursuits can be used to interact with public displays, for example. You can find more examples of how to use Pursuits, along with its technical details and evaluation, in the papers references at the bottom of this page. The following videos show use cases we tested in several studies, and an example of passer-bys playing a game with Pursuits.


Pursuits: Spontaneous Eye-Based Interaction for Dynamic Interfaces,
M. Vidal, A. Bulling and H. Gellersen, SIGMOBILE Mobile Computing and Communications Review. October 2014.
Pursuits: Spontaneous Interaction with Displays based on Smooth Pursuit Eye Movement and Moving Targets,
M. Vidal, A. Bulling and H. Gellersen, Proc. of UbiComp 2013. September 2013.
PDF | DOI | Video | Video of the Ubicomp Talk
Pursuits: Eye-Based Interaction with Moving Targets,
M. Vidal, K. Pfeuffer, A. Bulling and H. Gellersen, Proc. of CHI ’13 Extended Abstracts. May 2013.