Without getting too technical, the visual noise that causes visual dyslexia is generated by a finite group of wavelengths of light . A particular dyslexic may be adversely affected by one or more wavelengths from that finite group. Different dyslexics may be affected by different wavelengths but they will all be from that finite group.
The good news is that by filtering out all the wavelengths of light from that group at the same time a universal visual dyslexia filter has been developed that can remove all the visual noise for all visual dyslexics . This filter is used for the lenses of See Right Dyslexia Glasses and is effective at removing all the visual problems for all visual dyslexics.
Visual dyslexia exists across a spectrum from mild to severe and it is impossible to depict the variations of severity or all the different manifestations of visual distortions that visual noise causes and how the individual brain responds to that visual noise.
I have collected a few visual dyslexia videos and posted them on my web site where they are easier to view than here. Together they give a fair picture or representation of the types of visual problems that cause difficulty reading for visual dyslexics.