Methods and devices are disclosed herein for detecting and responding to changes in eye conditions during presentation of video on electronic devices. One embodiment involves monitoring, via an electronic tracking device, an eye of a person watching a video on an electronic device to monitor a viewing direction of the eye. The embodiment determines that the person is watching the video based on the viewing direction of the eye and detects a change in the viewing direction of the eye. In response to detecting the change in viewing direction of the eye, the embodiment determines that the person is focused on something other than the video based on additional monitoring of the eye. Presentation of the video is changed based on determining that the person is focused on something other than the video. For example, the video may be paused, discontinued, minimized, or a targeted advertisement inserted.