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During a longitudinal in-depth study of the reading acquisition and cognitive and visual development of four children with cerebral visual impairment, the children's visual acuity improved, but their full-scale IQs declined, mostly because of difficulties in abstract thinking, visual cognitive organization, and extremely low processing speed. The children had little interest in reading, but all acquired reading and writing abilities in different media.
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Ek et al. (2003) studied this question.
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