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Visual and binocular status in elementary school children with a reading problem
Lisa W Christian1, Krithika Nandakumar1, Patricia K Hrynchak1
1School of Optometry and Vision Science, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
Purpose:
This descriptive study provides a summary of the binocular anomalies seen in elementary school children identified with reading problems.
Methods:
A retrospective chart review of all children identified with reading problems and seen by the University of Waterloo, Optometry Clinic, from September 2012 to June 2013.
Results:
Files of 121 children (mean age 8.6 years, range 6-14 years) were reviewed. No significant refractive error was found in 81% of children. Five and 8 children were identified as strabismic at distance and near respectively. Phoria test revealed 90% and 65% of patients had normal distance and near phoria. Near point of convergencia (NPC) was <5cm in 68% of children, and 77% had stereoacuity of ≤40seconds of arc. More than 50% of the children had normal fusional vergence ranges except for near positive fusional vergencce (base out) break (46%). Tests for accommodation showed 91% of children were normal for binocular facility, and approximately 70% of children had an expected accuracy of accommodation.
Conclusion:
Findings indicate that some children with an identified reading problem also present with abnormal binocular test results compared to published normal values. Further investigation should be performed to investigate the relationship between binocular vision function and reading performance.
