They are mostly concerned with functions such as eyesight, hearing,sequencing and organisation, not combining as they should.
Dyslexia is when a child finds it difficult to decode in order to read and finds it difficult to spell.
Children with Dyslexia can find reading stressful. When young they can't hear rhyming words, can't hear initial sounds and find it difficult to match letters to sounds. Later on, they can have trouble memorising key words and spelling. Dyslexia can cause memory problems in other areas of learning such a remembering sequences. For example, the days of the week. It can cause difficulties in controlling stressful situations.