In 73 children with reading difficulty, ophthalmological evaluation showed that 18 hadovert refractive errors, 18 had dyslexia and no ocular anomalies, and 37 had impaired fusional amplitudes, 24 of whom were dyslexic. In all patients with poor fusional amplitudesthe reading mechanism could be improved with orthoptic exercises designed to augment the fusional amplitudes. The treatment did not affect the perceptual defect associated with dyslexia.
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