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Case Reports in Neurological Medicine
Volume 2013 (2013), Article ID 406861, 5 pages
http://dx.doi.org/10.1155/2013/406861
Case Report

Saccadic Alterations in Severe Developmental Dyslexia

1Department of Ophthalmology, Institute for Maternal and Child Health, IRCCS “Burlo Garofolo”, Via dell’Istria 65/1, 34137 Trieste, Italy
2Department of Electronics (DEEI), University of Trieste, 34127 Trieste, Italy
3Scientific Institute IRCCS “Eugenio Medea”, 33100 Udine, Italy
4Department of Experimental and Clinical Medical Sciences, DISM, ICBN, University of Udine, 33100 Udine, Italy

Received 11 April 2013; Accepted 19 May 2013

Academic Editors: M. Moonis and Z. Siddiqi

Copyright © 2013 Stefano Pensiero et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

It is not sure if persons with dyslexia have ocular motor deficits in addition to their deficits in rapid visual information processing. A 15-year-old boy afflicted by severe dyslexia was submitted to saccadic eye movement recording. Neurological and ophthalmic examinations were normal apart from the presence of an esophoria for near and slightly longer latencies of pattern visual evoked potentials. Subclinical saccadic alterations were present, which could be at the basis of the reading pathology: (1) low velocities (and larger durations) of the adducting saccades of the left eye with undershooting and long-lasting postsaccadic onward drift, typical of the internuclear ophthalmoplegia; (2) saccades interrupted in mid-flight and fixation instability, which are present in cases of brainstem premotor disturbances.