1. A method for comparing image portions of at least two images, comprising the steps of: displaying a first digital image on a display; determining gaze data of a user viewing the first digital image displayed on the display; determining the portion of the first digital image being viewed by the user corresponding to the determined gaze data to identify a first gaze region; accessing a second digital image; determining, in the second digital image, a second region corresponding to the first gaze region; and displaying the first and second gaze regions on the display.