Abstract
Aim: To evaluate the Tobii 1750 Eye Tracker system's usefulness in evaluating reading performance. Material: Twenty healthy subjects, aged 21–33 years, were measured with the Tobii 1750 Eye Tracker while reading two texts with equal readability rating. Reading speed was measured in words read per minute (wpm) from the onset of the first page to the conclusion of the last. Comprehension was enumerated as the ratio of correct answers (%). Eye movements were recorded as time-stamped coordinates of how the eyes moved over the screen. Results: There was a significant difference in reading speed and all eye movements except the saccade/regression ratio. Furthermore there was no significant difference in comprehension between the texts. Conclusion: The results show that texts used for studying reading performance most be chosen carefully as texts of the same linguistic difficulty, fonts, size and spacing can yield differences in reading performance, i.e. readability indexes are most likely not able to differentiate texts in a sophisticated enough manner. Furthermore, the results show that the Tobii system, despite its relative low resolution and sampling frequency, is suitable for evaluation of reading eye movements.
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