Eye Tracking in Usability Testing: Is It Worthwhile?   

The bottom line is how to ensure the customer that eye tracking provides additional value for their money. If we do numerical analysis in addition to video analysis, the need for extra time is remarkable and the analysis will become more expensive. To reduce analysis time we need automated special software and therefore we are currently developing scan path visualization software in which we include a new fixation recognition algorithm.

Aaltonen, Antti. ACM SIGCHI (1999). Articles>Usability>Testing>Eye Tracking