Those children may have a treatable vision disorder called convergence insufficiency, which makes it difficult to read, Robin Pauc said.
Convergence insufficiency is a common two-eye disorder in which the eyes fail to work properly at close range, said Pauc, who runs Tinsley House in Hampshire, a clinic for children with learning and behavioral problems.
The disorder can be treated by challenging the eyes to work properly using 3-D computer pictures, Pauc told The Daily Telegraph in a story published Friday.
Pauc is the author of the books "Is That My Child?" and "The Brain Food Plan."
'Happy' fan videos make Pharrell cry [VIDEO]
Pregnant Mila Kunis wins 'Best Villain' at MTV Movie Awards