![]() Here, we through smooth pursuit, without any saccadic movement. Trained readers have a higher visual span, allowing them to cover more text with fewer fixations.īy contrast, when we watch a distant car driving by, our eye movements are quite different. The term “visual span” refers to how many words we can read before and after the currently fixated word. We lock our eyes towards every 7-9 letters ( although this of course depends on the font type and size). When we read, for example, our eyes don’t travel smoothly. The eye movements between fixations are generally referred to as saccades. Fixations are excellent measures of visual attention, and research in this field has been continually growing. If a series of gaze points is very close – in time and / or space – this gaze cluster constitutes a fixation, denoting a period where the eyes are locked towards an object. ![]() If your eye tracker collects data with a sampling rate of 60 Hz, you will end up with 60 individual gaze points per second. Gaze points show what the eyes are looking at. When we talk about eye tracking, fixations and gaze points are the basic output measures of interest and often the most used terms.
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