Poor binocular coordination of saccades in dyslexic children.
OBJECTIVE
To examine the quality of binocular coordination of saccades in dyslexic children in single word reading and in a task requiring fixation of single LED.


METHODS
Eighteen children with dyslexia (11.4 +/- 2 years old) and 13 non-dyslexic children of matched age were studied. Horizontal saccades from both eyes were recorded with a photoelectric system (Oculomotor-Bouis).


RESULTS
Binocular coordination during and after the saccade in dyslexics is worse than that of non-dyslexic children; the disconjugacy does not depend on the condition. Moreover, dyslexics do not show the stereotyped pattern of disconjugacy (divergence during the saccade and convergence after the saccade). The conjugate post-saccadic drift is larger in dyslexics for both conditions.


CONCLUSIONS
Poor quality of binocular coordination of saccades and drift of the eyes after the saccade, regardless of the task, indicates an intrinsic ocular motor deficiency. Such a deficiency could be related to immaturity of the normal ocular motor learning mechanisms via which ocular motor coordination and stable fixation are achieved. Learning could be based on the interaction between the saccade and vergence subsystems. The cerebellum, but also cortical areas of the magnocellular stream such as the parietal cortex, could be the sites of ocular motor learning.
Bucci
Maria Pia
MP
IRIS Group, CNRS, Service OPH-ORL-Stomatologie, Hôpital Européen Georges Pompidou & Pôle Chirurgie ORL-OPH, Hôpital Robert Debré, Paris, France. mariapia.bucci@gmail.com
Brémond-Gignac
Dominique
D
Kapoula
Zoï
Z
D002648:Child; D004410:Dyslexia / Q000503:physiopathology*; D005403:Fixation, Ocular / Q000502:physiology; D006801:Humans; D009988:Orthoptics / Q000379:methods; D011597:Psychomotor Performance / Q000502:physiology*; D011932:Reading; D012438:Saccades / Q000502:physiology*; D015348:Vision, Binocular / Q000502:physiology*; D014792:Visual Acuity