Binocular coordination of saccades during reading in strabismic children
(Coordination binoculaire des saccades durant la lecture chez les enfants strabiques)

Lions C, Bui-Quoc E, Seassau M, Bucci MP.
Hopital Robert Debre, UMR 676 Inserm - Universite Paris Diderot, 48 Bd Serurier, Paris, 75019, France

PURPOSE : To our knowledge, studies comparing binocular eye movements during reading task in strabismic children are scarce. The goal of the present study was to examine binocular coordination of saccades during reading in strabismic children.

METHODS : Binocular eye movements were recorded by an infrared system (mobile EBT, e(ye)BRAIN) in eighteen strabismic children aged from 6.8 to 16 years old (mean age: 10.2 ± 3) who were asked to silently read a four line text during binocular viewing. Data were compared to that of eighteen age-matched non strabismic control children.

RESULTS : Saccade amplitude is similar in strabismic and in control children. In contrast, binocular coordination during and after the saccades is significantly poorer in strabismic children as opposed to control children; the duration of fixation is also significantly longer in strabismic children compared to controls. Binocular coordination in strabismic children who have binocular vision is better than those without binocular vision, but it is still worse than control subjects.

CONCLUSIONS : In strabismic children binocular saccade coordination is deficient and could be responsible for impaired reading capabilities. Binocular vision plays an important role in improving binocular saccade yoking.

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