From my experience helping students across a whole spectrum of dyslexic conditions of all ages - dyslexia boils down to difficulties across 4 areas.
1: Visual Perception
2: Auditory Processing
4: Information filtering
This sounds a lot simpler than the endless technical jargon of psychological reports.
We see differently, we take information into our heads differently, it comes back out of our mouths and on to the page differently, we swap orientations and don't know our left from right and we become overloaded in certain situations and can't filter the information to focus on what is important. Dyslexia Spectrum in a nut shell. All you simply have to do is to work on these core skills and work in the way that suits the learner best - match their learning style to overcome the area or areas that hold them back.
Dr. Naoisé O'Reilly, Expression Developist™.