National Institute of Neurological Disorders and Stroke defines reading disability or dyslexia as follows: "Dyslexia is a brain-based type of learning disability that specifically impairs a person's ability to read. These individuals typically read at levels significantly lower than expected despite having normal intelligence. Although the disorder varies from person to person, common characteristics among people with dyslexia are difficulty with spelling, phonological processing (the manipulation of sounds), and/or rapid visual-verbal responding. In adults, dyslexia usually occurs after a brain injury or in the context of dementia. It can also be inherited in some families, and recent studies have identified a number of genes that may predispose an individual to developing dyslexia." 
Dyslexia is a learning disability that manifests itself as a difficulty with word decoding, reading comprehension and/or reading fluency. It is separate and distinct from reading difficulties resulting from other causes, such as a non-neurological deficiency with vision or hearing, or from poor or inadequate reading instruction. It is estimated that dyslexia affects between 5–17% of the population. Dyslexia has been proposed to have three cognitive subtypes (auditory, visual and attentional), although individual cases of dyslexia are better explained by the underlying neuropsychological deficits and co-occurring learning disabilities (e.g. attention-deficit/hyperactivity disorder, math disability, etc.). Although not an intellectual disability, it is considered both a learning disability and a reading disability. Dyslexia and IQ are not interrelated, since reading and cognition develop independently in individuals who have dyslexia."Nerve problems can cause damage to the control of eye muscles which can also cause diplopia" (WEBMD, 2005)
Hyperlexic children are characterized by having average or above average IQs and word-reading ability well above what would be expected given their ages and IQs. Hyperlexia can be viewed as a superability in which word recognition ability goes far above expected levels of skill. Some hyperlexics, however, have trouble understanding speech. Most or perhaps all children with hyperlexia lie on the autism spectrum. Between 5–10% of autistic children have been estimated to be hyperlexic.
^Stanovich KE (December 1988). "Explaining the differences between the dyslexic and the garden-variety poor reader: the phonological-core variable-difference model". Journal of Learning Disabilities21 (10): 590–604. doi:10.1177/002221948802101003. PMID2465364.
^McCandliss BD, Noble KG (2003). "The development of reading impairment: a cognitive neuroscience model". Ment Retard Dev Disabil Res Rev9 (3): 196–204. doi:10.1002/mrdd.10080. PMID12953299.
^ abCzepita D, Lodygowska E (2006). "[Role of the organ of vision in the course of developmental dyslexia]". Klin Oczna (in Polish) 108 (1–3): 110–3. PMID16883955.
^Birsh, Judith R. (2005). "Research and reading disability". In Judith R. Birsh. Multisensory Teaching of Basic Language Skills. Baltimore, Maryland: Paul H. Brookes Publishing. p. 8. ISBN1-55766-676-8. OCLC57652241.
^Facoetti A, Lorusso ML, Paganoni P et al. (April 2003). "Auditory and visual automatic attention deficits in developmental dyslexia". Brain Res Cogn Brain Res16 (2): 185–91. doi:10.1016/S0926-6410(02)00270-7. PMID12668226.CS1 maint: Explicit use of et al. (link)
^Ferrer E, Shaywitz BA, Holahan JM, Marchione K, Shaywitz SE (January 2010). "Uncoupling of reading and IQ over time: empirical evidence for a definition of dyslexia". Psychol Sci21 (1): 93–101. doi:10.1177/0956797609354084. PMID20424029.