1. Eyetracking and the Eye

4 How Modern Eyetracking Works 6 Foveal Vision vs. Peripheral Vision   Fixations and Saccades Why Do Users Not See Something? 9 The Mind–Eye Hypothesis 10 Are Looks Good or Bad? 10 Visualizing Eyetracking Results   Viewing the Heat Maps and Gaze Plots in This Book 13 Tasks Determine Looks 17 Other Uses of Eyetracking   Eyetrackers as Input Devices

Eyetracking is simply following the trail of where a person is looking. With current technology, it is fairly easy to observe the path where users look on a computer screen. Eyetracking equipment can be built into the computer monitor, and eyetracking software can keep track of what’s displayed on the screen while the user is looking at it.