Dyslexia is a partial reading disorder. More: https://argoprep.com/blog/numerical-dyslexia-should-my-child-take-a-dyscalculia-test/.

It is caused by a breakdown or lack of formation of the mental functions involved in the reading process.

In dyslexia, various signs and symbols are not correctly recognized. And then, there are difficulties in understanding the meaning of what is read. In most cases, if you give the disorder the attention it deserves as a child, as an adult you will be able to avoid these problems.

Dyslexia is a partial reading disorder.

It is caused by a breakdown or lack of formation of the mental functions involved in the reading process.

In dyslexia, various signs and symbols are not correctly recognized. And then, there are difficulties in understanding the meaning of what is read. In most cases, if you give the disorder proper attention in childhood, as an adult you will be able to avoid these problems.

Types of Dyslexia.

The symptoms of dyslexia will depend on its type. A total of six types of the disorder are distinguished:

Mnastic dyslexia – in the pronunciation of words there are difficulties in recognizing letters.
Agrammatical dyslexia – underdeveloped speech. There are errors in grammatical structure. Inconsistent tenses, cases and endings agree incorrectly. (For example: “I do not want to go to the movies,” “gray cat”).
Semantic dyslexia: words that are normally available are read in isolation from the text. This results in the dyslexic not understanding the essence of what is being read.
Tactile dyslexia is characteristic of blind people. While reading in Braille, the dyslexic’s fingers slip on other lines. Letters are confused with similar spelling).
Optical dyslexia – when reading, the child slips into other lines, or reads the opposite way. Does not understand letters that consist of the same elements, but are spelled differently (for example: P-N-I).
Acoustic (phonemic) dyslexia is the most common type of dyslexia in children 5-9 years of age. It is characterized by the transposition of syllables, the mixing of letters on the same distinguishable feature in similar words (for example: “nisha-shina”, “sleep-nose”).

Causes of dyslexia.

Neurobiological factors producing the development of dyslexia are considered to be:

The predominance of right hemisphere brain activity.
Imbalance between the hemispheres of the brain.
Craniocerebral injuries.
Severe infections. (For example: meningitis).
Childbirth disorders. (For example: premature detachment of the placenta, fetal asphyxia).
Complications of pregnancy associated with infections. (For example: measles, herpes). Possibly with the use of toxic substances (drugs, alcohol, smoking).
Equally important are social factors: heavy workload, a dysfunctional environment, lack of communication, isolation syndrome. And I am expressed in a complete loss of speech and paralysis.