This definition is viewed as both too broad and too narrow of a scope. It can encompass students with brain trauma or educational deprivation but also leave out students with more subtle reading difficulties. A meaningful definition allows for effective and efficient communication. This definitions by IDA are the ground floor where reading research can start to build upon.
Now that time has passed and the research is complete, the need for consensus on the definition of Dyslexia persists. In the above article, Emmerson Dickman says clearly, “ The term dyslexia means many things to many people. It is used by some as an excuse to explain perceived failure and by others as a characteristic to support superiority.” and we see this disconnect in classrooms and schools across the country.