People with dyslexia are found in every country. European literature reports that these children make up 10-15% of schoolchildren, 4% of whom have very severe difficulties (according to the International Classification of Diseases ICD-10, DSM-IV), which could be called profound dyslexia.

The European Dyslexia Association reported in 1998 that there were 37 million dyslexics in the countries of the European Union. The prevalence of dyslexia is estimated to be around 10% of the population.

The number of dyslexic children is increasing. In recent years dyslexia has become a problem not only for primary school children, but also for secondary school students.