Dyslexia can be confusing. Because of the dysgraphia (flipping of letters and poor handwriting), it is often thought that dyslexia is purely a physical problem with the eyes. Speaking as a teacher of the visually impaired, that is not the case. Dyslexia is more complicated than that.
Dyslexia is, primarily, difficulty with auditory processing. They do not hear individual sounds within words. They are not able to rhyme or break apart words into syllables and they are not able to blend induvial sounds into words without one to one tutoring on those skills. Spelling is also difficult for them because they are unable to think of the sounds and then the letters that go with the sounds and get them onto paper.
Both of these symptoms make writing a story difficult for the student with dyslexia. They lose track of where they are in their story, have a difficult time with their spelling, and can even have a difficult time with using the correct punctuation. However, if you ask the student to tell you the story, they are often quite imaginative and rich in details.
Programs that can do speech to text can be quite helpful for students to get their thoughts onto paper. This also helps them not struggle as much with forming letters. Learning how to use computers is important for everyone, but for those with dyslexia and other disabilities, it is even more important. The freedom that technology brings with it allows those with disabilities to shine.