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Vertical disconjugacy during reading in dyslexic and non-dyslexic children

Abstract : The objective of this study was to explore vertical binocular coordination in dyslexic and non-dyslexic children during saccades and post-saccadic fixation period while reading a text. Methods: Binocular eye movements were recorded by an infrared system (Mobile T2 ® , SuriCog) in thirty-six dyslexic children from 7.3 to 13.6 years of age (mean age: 10.4 ± 0.3 years) who were asked to silently read a four-line text during binocular viewing. Data were compared to those of thirty-six age-matched non-dyslexic children. Results: Vertical disconjugacy during post-saccadic fixation was higher in dyslexic children with respect to non-dyslexic children group. Vertical disconjugacy was not age-dependent either for dyslexic children or for non-dyslexic children. Conclusions: The poor binocular vertical coordination observed in dyslexic children while reading could suggest adeficiency in the cerebellum and/or extra-ocular muscles involved in vertical eye alignment. Moreover, the fact that this vertical binocular coordination was not age-dependent could be due to an abnormal eye position and/or to a dysfunction of midbrain structures involved in vertical vergences.
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Submitted on : Wednesday, February 24, 2021 - 4:14:18 PM
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Nathalie Goulème, Cynthia Lions, Christophe-Loic Gerard, Hugo Peyre, Hung Thai-Van, et al.. Vertical disconjugacy during reading in dyslexic and non-dyslexic children. Neuroscience Letters, Elsevier, 2018, 671, pp.82-87. ⟨10.1016/j.neulet.2018.02.016⟩. ⟨hal-03151289⟩



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