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Dyslexia does not resolve over time.  Longitudinal studies indicate that dyslexia is a persistent, chronic condition; it does not represent a transient "developmental lag.”    The  image on the left shows the  trajectory of reading skills over time in good and poor readers. The vertical axis on the left is the reading achievement score

Dyslexia reflects a very specific difficulty with reading and has nothing to do with intelligence. In fact, understanding ideas and concepts are often at a very high level in dyslexia as are other higher-level reasoning skills. Dyslexia is a localized problem, one involving the sounds, and not the meaning, of spoken language. Consideration of the differences between spoken and written language provides a helpful understanding of why some bright children struggle to read.

In dyslexic readers, converging evidence from many laboratories around the world has demonstrated “a neural signature for dyslexia,” that is, a disruption of the two neural systems in the back of the brain observed during reading (shown in the image below).

Barnes & Noble's Nook, and the Intel Reader. But the jury is still out on just how effective those digital tools are in helping struggling readers.

Foss, who himself has dyslexia, created the Intel Reader, a mobile e-reader that can take pictures of text and then convert the text into an audio file within seconds. Students can also change the size of the text on the screen and the speed of the voice that reads the text aloud.