In one exemplary embodiment, a method includes the step of obtaining, with an eye-tracking system, one or more user eye metrics, while the user is reading a text content. A step can include determining that the one or more user eye metrics indicate a user mental fatigue state based on the one or more user eye metrics. A step can include modifying an attribute of the text content. One or more user eye metrics that indicate the user mental fatigue state comprise a decrease in saccadic peak velocity during a task. The one or more user eye metrics that indicate the user mental fatigue state comprises a regression analysis of a relationship of the saccadic peak velocity, a user blink attribute, and a measurement of an ocular instability of the user.
METHOD AND SYSTEM OF MODIFYING TEXT CONTENT PRESENTATION SETTINGS AS DETERMINED BY USER STATES BASED ON USER EYE METRIC DATA