The lens was connected to an aluminum pointer that moved in response to the movement of the eye. The eyes never move smoothly over still text.Įdmund Huey built an early eye tracker, using a sort of contact lens with a hole for the pupil. This is the typical pattern of eye movement during reading. This observation raised important questions about reading, questions which were explored during the 1900s: On which words do the eyes stop? For how long? When do they regress to already seen words?Īn example of fixations and saccades over text. For example, Louis Émile Javal observed in 1879 that reading does not involve a smooth sweeping of the eyes along the text, as previously assumed, but a series of short stops (called fixations) and quick saccades. In the 1800s, studies of eye movement were made using direct observations. 6.2 Eye-tracking of younger and elderly people while walking.6.1 Eye-tracking while driving a car in a difficult situation.
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