The Hunt for Usability: Tracking Eye Movements    

Usability testing methods have not changed significantly since the origins of the practice. Usability studies typically address human performance at a readily observable task-level, including measures like time to complete a task, percentage of participants succeeding, type and number of errors, and subjective ratings of ease of use. Certain types of questions are difficult to answer efficiently with these techniques.

Karn, Keith S., Steve Ellis and Cornell Juliano. Conference on Human Factors in Computing Systems (1999). Articles>Usability>Methods>Eye Tracking

One Hundred and One Spots, or How Do Users Read Menus?  

Proceedings of a paper about how readers interact with designed documents.

Aaltonen, Antti, Aulikki Hyrskykari and Kari-Jouko Raeihae. Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (1998). Articles>Document Design>Interaction Design>Usability

Trials and Tribulations of Using an Eye-Tracking System    

This paper's focus is on the challenges associated with collecting eye-tracking data. Despite operator training conducted by the manufacturer, one year of experience with eye-tracking and extensive calibration, the data collection success rate in the current investigation was very low; only six out of sixteen participants (37.5%) were successfully eye-tracked. We discuss possible explanations for this low success rate, and why we do not currently believe that eye-tracking is ready to be employed in usability laboratories.

Schnipke, Susan K. and Marc W. Todd. Conference on Human Factors in Computing Systems (2000). Articles>Usability>Methods>Eye Tracking