When I went to school many long years ago, dyslexia was barely accepted as a problem. Children with the malady did the best they could and parents assumed they just didn't like school. Today, a great deal is known about it.
The main issue with dyslexia is word jumble. Reading "smile" for the word "slime" and so on. This means that teachers assume such student have difficulty spelling when they don't. Dyslexia sufferers also do not have a poor memory.
Unfortunately, there is no cure and the severity of the "disease" varies. Phonics offers something. This is teaching syllable sounds with actual reading. Lastly, there is no genetic cause for dyslexia.