[Ocular movements and reading: a review].
A literature review of the important findings discovered over the past three decades on ocular movements during reading is presented herein. This fairly recent function in human evolution is a sophisticated sensorimotor and cognitive activity that brings very complex neurological and motor mechanisms into play. However, knowledge in this field is limited, even though reading problems are very common in children. We collected all the references in PubMed dating from 1969 to 2009 using the following "binocular coordination", "eye movements", "reading", and "dyslexia". When reading, the visual axes move in a very particular way, notably with regard to the parallelism of the ocular axes when saccades are triggered to reach the words to be read and during fixations, which enable decoding. In fact, when reading, the visual axes are often disassociated, even going as far as to intersect in a considerable number of cases. There are relatively few studies that have examined binocular coordination during reading. We are beginning to understand how the ocular axes move during horizontal saccades. Three-dimensional studies could be the next step to providing more precise data.
Quercia
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Service d'ophtalmologie, CHU de Dijon, 15, rue du Clair-Matin, 21200 Beaune, France. Patrick.Quercia@u-bourgogne.fr
D002648:Child; D002657:Child Development / Q000502:physiology; D004410:Dyslexia / Q000209:etiology / Q000503:physiopathology; D005133:Eye Movements / Q000502:physiology*; D006801:Humans; D011932:Reading; D012438:Saccades / Q000502:physiology; D015348:Vision, Binocular / Q000502:physiology