In online lectures, using signaling (e.g., with a digital pointer) provides known benefits for learners as it provides an explicit means of directing the learners' attention. In addition to providing this directive, it accomplishes a synchronicity between the learners attention. But does general synchronicity in eye movements predict learning success? In two studies, we investigated, to which extent learners follow a digital laser pointer on the slide in two conditions (with and without an on-screen instructor) and whether gaze synchronization metrics predict learning success (i.e. post-quiz performance). We found that gaze synchronicity (how synchronous an individual is to the average of all learners) can predict learning success. In addition, the average distance between the learner’s gaze and the pointer position predicts the student’s quiz performance, independent of the presence of an on-screen instructor. These insights can help in creating automated immediate-feedback systems for educational videos.