"Dyslexia" cannot be meaningfully distinguished from "poor reading skills" in any measurable way. There is no evidence for the efficacy of any intervention that is uniquely suited to dyslexia; All effective interventions are equally effective in improving the reading skills of non-dyslexic individuals. There is no evidence for the efficacy of special fonts, coloured overlays or any other visual aid. These interventions are simply placebo and are likely to distract from proven interventions which are known to be effective.
The popular notion of dyslexia as a unique neurological disorder has no basis in fact. There is no agreed-upon definition of dyslexia beyond the very general description of "a significant impairment in reading ability without significant cognitive impairment". The intellectually honest thing would be to abandon the term completely in favour of a simple factual description such as "poor reading skills", but this is politically unlikely.