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I am going to write an easy about Dyslexia.
Introduction of Dyslexia
First of all, Dyslexia is generally defined as a form of learning disability disorder that patient is impaired to understand written language but not caused by low intelligence or brain damage. Its symptoms are: slow reading and writing; inability of spelling; bad perform in academic tasks, but has at least average intelligence. Thus it is generally difficult to detect this LD(learning disability) in early age. Cause of Dyslexia

There are three main types of dyslexia:
Developmental dyslexia is caused by the early stage of Fetal development of hormones. Thus developmental dyslexia will decrease as the child get mature, mostly results in boys. ‘A general practioner in Sussex, W.P. Morgan, wrote to The Lancet giving an account of the reading problems experienced by an apparently normal boy who had suffered no brain damage. Thus it is to Morgan (1896) that we owe the first description in the medical literature of what is now referred to as developmental dyslexia or specific reading disability. His account of what he called ‘’congenital word-blindness’’ ran as follows: Percy F.—a well-grown, aged 14—is the eldest son of intelligent parents... he has always been a bright and intelligent boy, quick at games and no way inferior to others of his age. His greatest difficulty has been – and is now—his inability to learn to read, This inability is so remarkable, and so pronounced, that i have no doubt it is due to some congenital defect... the greatest efforts have been made to teach him to read , but, in spite of this laborious and persistent training, he can only with difficulty spell out words of one syllable.. The schoolmaster who has taught him for some years says that he would be the smartest lad in the school if the instruction were entirely oral.. His father informs me that the greatest difficulty was found in teaching the boy his letters, and they thought he never would learn them.(Morgan,1896,p.1378)’’ (Dyslexia, Reading and the Brain by Alan A.Beaton,p.4) Primary dyslexia is hereditary of the dysfunctional of cerebral cortex (the left side of the brain) which does not reduce as the child gets mature. Similar to developmental dyslexia, it is mostly found (inherited) in boys than girls ,’’by a ratio of three or four to one’’(The reality of Dyslexia by John Osmond, on page 18). Trauma dyslexia is caused by an after injury or tarmac to the reading and writing part of brain (e.g.left hemisphere) ‘Broadbent(1872) himself had described patients who were unable to read following brain injury, albeit that they also showed some evidence of ‘verbal aphasia’’(p.150) on the other hand, Broadbent (1896) conceded that it might have been Kussmaul who first described difficulty with reading as ‘’ an isolated condition’’—that is , as occurring in the contest of intact speech (see also Dejerine, 1891, 1892). The word dyslexia was first used (see Hinshelwood,1896) by a German ophthalmologist, R. Berlin, when referring to reading difficulties caused by cerebral disease or injury(Berlin,1887)’ (Dyslexia,Redading and the Brain by Alan A.Beaton,p.4) http://www.mamashealth.com/dys.asp

Although Dyslexia can be resulted from genetic/inheritance factor, but it doesn’t mean a dyslexic parent will automatically have a dyslexic child, or that a left-handed child will necessarily be dyslexic. A large area of research suggested that dyslexia is commonly found in families who have more than half left-handedness genetic member or between a third and a half of children have a learning difficulties history in their family. ‘in the report of ‘’congenital word-blindness’’ in a father and two sons, DREW (1956) wrote: ‘It is impossible to avoid comparision of the findings in these patients with hereditary dyslexia and other acquired cerebral lesions’’(p.455)’ (Dyslexia, Reading and the Brain by Alan A.Beaton,p.4) The relation between acquired (trauma) and developmental forms of dyslexia...
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