An apparatus having a computing device and a user interface—such as a user interface having a display that can provide a graphical user interface (GUI). The apparatus also includes a camera, and a processor in the computing device. The camera can be connected to the computing device and/or the user interface, and the camera can be configured to capture pupil location and/or eye movement of a user. The processor can be configured to: identify a visual focal point of the user relative to the user interface based on the captured pupil location, and/or identify a type of eye movement of the user (such as a saccade) based on the captured eye movement. The processor can also be configured to control parameters of the user interface based at least partially on the identified visual focal point and/or the identified type of eye movement.