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By means of a synoptophore vergence eye movements were recorded in dyslexic and normal children while they were attempting to track small targets moving in simulated depth. Of the dyslexic children 64% were unable to make proper vergence movements when macular sized fusion targets (2 1/2 degrees) were employed, but their vergence control was better for larger (7 degrees) targets. The normal readers and the remaining dyslexics showed normal vergence responses for both large and small moving fusion stimuli. The results suggest that many dyslexics suffer a disorder of visuomotor control and perception for stimuli falling on the macula; this may explain their characteristic visual problems when reading. Hence recording vergence eye movement responses to small moving fusion stimuli may be useful in the investigation and treatment of children with reading difficulties.

Original publication

DOI

10.1136/bjo.72.3.162

Type

Journal article

Journal

Br J Ophthalmol

Publication Date

03/1988

Volume

72

Pages

162 - 166

Keywords

Child, Convergence, Ocular, Depth Perception, Dyslexia, Eye Movements, Humans, Macula Lutea, Motion Perception