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Visual Aspects of Dyslexia$
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John Stein and Zoï Kapoula

Print publication date: 2012

Print ISBN-13: 9780199589814

Published to Oxford Scholarship Online: September 2012

DOI: 10.1093/acprof:oso/9780199589814.001.0001

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Subitizing, Dynamic Vision, Saccade and Fixation Control in Dyslexia

Subitizing, Dynamic Vision, Saccade and Fixation Control in Dyslexia

(p.15) Chapter 2 Subitizing, Dynamic Vision, Saccade and Fixation Control in Dyslexia
Visual Aspects of Dyslexia

Burkhart Fischer

Oxford University Press

The chapter deals with two visual (dynamic vision and subitizing) and two optomotor aspects (saccade control and fixation) of dyslexia. In each domain variables and the methods for their assessments are defined. The following studies are described: 1. Development: Assessment of normal (control) subjects from 7 to 17 years old. 2. Diagnosis: Assessment of dyslexic subjects and comparison with age-matched controls. The percentages of subjects failing to reach the 16th percentile was determined. 3. Training: Affected subjects were given specific, adaptive, and controlled daily training at home. Pre and post training data were compared and the percentage of subjects who reached the control range determined. 4. The transfer of the optomotor training to reading skills was investigated by comparing a trained group with an untrained waiting group. 5. The percentages of dyslexics suffering from auditory and/or visual or optomotor deficits were estimated. In conclusion, there was a very small pure “visual” subgroup of dyslexics — below 7%. On the other hand between 80% and 92% of dyslexics (depending on age) suffered from both visual/optomotor and auditory deficits. This means that one has to identify the deficits in each individual dyslexic subject and try to reduce his identified problems by training. Further remediation may be required to further improve reading and spelling skills.

Keywords:   dynamic vision, subitizing, optometer, saccade, auditory

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