Dyslexia

Dyslexia or word blindness is a disorder in which people have major problems with reading and writing. Dyslexia is often described as "not being able to read and write well". This is not entirely correct, as people without dyslexia can also have difficulty with this. People with dyslexia have difficulty making speech sounds from letters and words on paper. They cannot immediately say a word on paper out loud or write down a spoken word immediately.

People with dyslexia differ letters that sound (approximately) the same with each other or reverse the order of sounds. You also have trouble remembering which letters go with which sounds