Understanding what the eyes are looking at and what activity they are doing can help man-machine interface technology and advance many high-tech applications.
There are many new high-tech systems and services that rely on recognising human actions and behaviour. As more automation and machine intelligence rely on human-machine interaction, it is important to advance this discipline and further its potential. One particular area of interest is understanding eye movements (i.e. where you're looking, what you're looking at or how you're looking) and getting intelligent machines to react accordingly.
Further details: What do I spy with my little eye?