22. The system as recited in claim 18 , wherein the irregularity is indicative of a personal interest, and the computer-executable instructions further cause the one or more processors to display a recommendation based at least in part on the personal interest.
18. A system comprising: one or more processors; an eye sensor device; and one or more computer-readable storage media storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to: receive, from the eye sensor device, information related to a gaze direction of eyes of a user as the user reads displayed text of a document in a first formatted version; determine, based on an analysis of the information related to the gaze direction, a current reading speed of the displayed text; detect that an irregularity occurs based on a determination that the current reading speed is less than a regular reading speed of the user; determine that the irregularity is associated with a display screen location that contains a portion of the displayed text; and associate the display screen location that contains the portion of the displayed text with an identifiable section within a second formatted version of the document that is different than the first formatted version of the document, wherein the identifiable section comprises a page.