The problem in dyslexia is a linguistic one, not a visual one. Dyslexia in no way stems from any lack of intelligence. People with severe dyslexia can be brilliant.
Dyslexia spelled out in letters.
Dyslexia commonly causes difficulties in word recognition, spelling and decoding.
The effects of dyslexia, in fact, vary from person to person. The only shared trait among people with dyslexia is that they read at levels significantly lower than typical for people of their age. Dyslexia is different from reading retardation which may reflect mental retardation or cultural deprivation.