A gaze tracking method comprising: obtaining a set of images of an eye captured by a camera, wherein a plurality of images from the set of images was captured when the eye was gazing at respective known stimulus points (601, 602, 604); for each image from the plurality of images: obtaining first gaze data indicating a point at which the eye was gazing when the image was captured and/or a direction in which the eye was gazing when the image was captured, wherein the first gaze data obtained for the image indicates a known position of the stimulus point and/or a known direction from the eye towards the stimulus point, and estimating a position of a center of a pupil of the eye in the image; calibrating a mapping (510, 520, 530) using the obtained first gaze data and the estimated positions of the center of the pupil, wherein the mapping is adapted to map positions of the center of the pupil of the eye in images captured by the camera to: gaze points (511, 521) of the eye at a surface (512, 522), or gaze directions of the eye; obtaining a further image of the eye captured by the camera; estimating a position of the center of the pupil in the further image; and performing gaze tracking using the calibrated mapping and the estimated position of the center of the pupil in the further image, the method being characterized in that it further comprises: estimating whether the eye is directed towards a central region of a field of view of the eye; and in response to the eye being directed towards said central region, outputting second gaze data determined by performing a second type of gaze tracking different than the gaze tracking that uses the calibrated mapping and the estimated position of the center of the pupil in the further image, wherein the second type of gaze tracking is a pupil center corneal reflection (PCCR) based gaze tracking. obtaining a set of images of an eye captured by a camera, wherein a plurality of images from the set of images was captured when the eye was gazing at respective known stimulus points (601, 602, 604); for each image from the plurality of images: obtaining first gaze data indicating a point at which the eye was gazing when the image was captured and/or a direction in which the eye was gazing when the image was captured, wherein the first gaze data obtained for the image indicates a known position of the stimulus point and/or a known direction from the eye towards the stimulus point, and estimating a position of a center of a pupil of the eye in the image; calibrating a mapping (510, 520, 530) using the obtained first gaze data and the estimated positions of the center of the pupil, wherein the mapping is adapted to map positions of the center of the pupil of the eye in images captured by the camera to: gaze points (511, 521) of the eye at a surface (512, 522), or gaze directions of the eye; obtaining a further image of the eye captured by the camera; estimating a position of the center of the pupil in the further image; and performing gaze tracking using the calibrated mapping and the estimated position of the center of the pupil in the further image, the method being characterized in that it further comprises: estimating whether the eye is directed towards a central region of a field of view of the eye; and in response to the eye being directed towards said central region, outputting second gaze data determined by performing a second type of gaze tracking different than the gaze tracking that uses the calibrated mapping and the estimated position of the center of the pupil in the further image, wherein the second type of gaze tracking is a pupil center corneal reflection (PCCR) based gaze tracking. estimating whether the eye is directed towards a central region of a field of view of the eye; and in response to the eye being directed towards said central region, outputting second gaze data determined by performing a second type of gaze tracking different than the gaze tracking that uses the calibrated mapping and the estimated position of the center of the pupil in the further image, wherein the second type of gaze tracking is a pupil center corneal reflection (PCCR) based gaze tracking.