1. An eye-tracking method adapted to be implemented by an eye-tracking system, said eye-tracking method comprising: A) while a user is gazing at a gazing location on a screen module and a pair of light sources emit light toward an eye of the user, configuring the eye-tracking system to acquire an image of the eye of the user captured by an image-capturing module, the image including a pupil of and a pair of reflected light spots on the eye of the user; B) configuring the eye-tracking system to determine an angle and an area based on positions of the pupil and the reflected light spots in the image acquired in step A), wherein the angle and the area determined in step B) correspond to the gazing location; C) configuring the eye-tracking system to determine coordinates on the screen module based on the angle and the area determined in step B), wherein the coordinates determined in step C) correspond to the gazing location; and D) configuring the eye-tracking system to perform an operation associated with the coordinates determined in step C).