Dyslexia is a specific learning disorder—a problem not with intelligence or a lack or trying, but with the ability of children to learn to read. It affects 3-20% of children (depending on the exact definition used). Because reading is essential to school success in almost every subject, problems with reading need to be addressed as early as possible.
One kind of therapy for dyslexia is based on the premise that reading problems are caused by vision problems—though the scientific community isn’t convinced that this is the case. The large, national professional bodies representing pediatricians, ophthalmologists, and optometrists recommend only routine vision screening for children having reading difficulties. Nonetheless, there’s a cottage industry of so-called developmental or behavioral optometrists who offer a variety of services commonly called “vision therapy” to help with reading problems and other developmental challenges. There is very little objective evidence that any of these therapies offer more than short-term improvement. Besides, they’re very expensive, and often not covered by medical or vision insurance. Parents need to know whether this kind of therapy is worth pursuing.
Researchers in the UK published a study in May, 2015, looking at a large number of children in a birth cohort from the early 1990’s. These children had all had thorough serial health assessments as they grew. For this specific study, they found that 3% (172 kids) in the birth cohort of 5822 children met objective criteria for reading impairment. All of these children had a very through vision evaluation, and most of those were completely normal; the small number of reading-disabled kids who weren’t 100% normal on their vision assessment had subtle abnormalities. The authors concluded “We found no evidence that vision-based treatments would be useful to help children with severe reading impairment.”
A strength of the study was that it was population-based—it didn’t just include children referred to a clinic because of problems. And the findings were objective and validated. However, the authors only looked at the most severe level of reading impairment. It’s possible they may have missed vision issues in less-affected children (though one would think, if vision were the root of reading problems, that the worst readers would have the most egregious and easily-identified vision problems.)
This study adds to the weight of evidence that “vision therapy” is unlikely to be useful for reading problems, and may be a waste of time and money.
This blog was originally posted on The Pediatric Insider.
© 2015 Roy Benaroch, MD
