Elementary school children who read below grade level may have challenges with their eyesight even if standard tests show they see 20/20, according to a new study from the University of Waterloo.

The study showed that children with reading challenges may have lower than expected binocular vision test results, something a standard eye exam may overlook.

"A complete binocular vision assessment is not always part of the standard vision test," said Dr. Lisa Christian, lead researcher on the project and an Associate Clinical Professor at the School of Optometry and Vision Science, University of Waterloo. "However, binocular vision problems could be compounding a child's academic difficulties, and should be investigated."