I went back to the two links given by Ellenpoly. The first was an article that appeared in the New Scientist two years ago, describing (not endorsing) a study in which children who appeared to be dyslexic were divided into two groups: one half did exercises for six months and the other half didn't. They were evaluated after six months and the result was that of the group who did the exercises, fewer than 25% had experienced improvement in their reading skills. We are not told in the article how many of the children who did not do the exercises experienced improvement in their reading skills. We are also not told in the article that there is nothing new about these exercises - but I have a book on my shelves called The Gift of Dyslexia first published in 1994 - ten years ago - which uses the same and similar exercises, and the author had been using them at his Dyslexia Correction Center since 1982. The New Scientist is correct in labeling this approach controversial - but it's not controversial because it's new, or radical, or offers a challenge to conventional wisdom, but because it's still pulling people in even though it's based on a theory which has been proven to be incorrect.

Almost all of the remedial reading therapies targeted at dyslexics can and will boast of some success, because in addition to their own gimmick, they also feature one-on-one tutoring, and almost everyone can benefit from one-on-one tutoring.

The other link that Ellenpoly put up took me to a google page on the subject of coloured lenses. I picked two at random. The first describes them as quackery (this piece quotes several well-researched studies)
and the second takes me to the American Academy of Pediatrics clinical report on the subject of Learning Disabilities, Dyslexia and Vision. Here is what they say in a nutshell: "Learning disabilities are common conditions in pediatric patients. The etiology of these difficulties is multifactorial, reflecting genetic influences and abnormalities of brain structure and function. Early recognition and referral to qualified educational professionals is critical for the best possible outcome. Visual problems are rarely responsible for learning difficulties. No scientific evidence exists for the efficacy of eye exercises ("vision therapy") or the use of special tinted lenses in the remediation of these complex pediatric developmental and neurologic conditions." It goes into greater detail, but that's the abstract.