Dyslexia is associated with reading difficulties for no apparent reason. If you look at the literal meaning of dyslexia, it is defined by the Collins English Dictionary as follows:
Unfortunately, people who have been told that they have dyslexia, often have Irlen Syndrome, AND THAT IS WHAT IS CAUSING THEIR DYSLEXIA!
The symptoms of dyslexia have been variously described as words moving, reversing words, inserting words, omitting words, missing lines when reading as well as other things that happen for some people when reading. These symptoms are also the symptoms of Irlen Syndrome, which is a visual processing dysfunction. Visual processing occurs when our brain processes the visual signals sent to the visual cortex from our eyes. It is not a problem with our eyesight.