Origin and Etymology of alexia. New Latin, from a- + Greek lexis speech, from legein to speak — more at legend. First Known Use: 1875.
https://www.merriam-webster.com/dictionary/alexia
It often occurs in people with attention deficit hyperactivity disorder (ADHD) and is associated with similar difficulties with numbers. It may begin in adulthood as the result of a traumatic brain injury, stroke, or dementia. The underlying mechanisms of dyslexia are problems within the brain's language processing.
https://en.wikipedia.org/wiki/Alexia_(condition)
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https://www.merriam-webster.com/dictionary/alexia
an inability to understand written language. A form of receptive aphasia caused by lesions in the parietal or parietal-occipital areas of the brain. The condition may be congenital or acquired as a result of disease or injury. Also called alexia.
http://medical-dictionary.thefreedictionary.com/Alexia+(disorder)
Medical Definition of Agnosia. Agnosia: An inability to recognize sensory inputs such as light, sound, and touch). Agnosia is typically a result of brain injury. For example, damaging the back part of the brain can cause visual agnosia (inability to properly recognize objects by sight). Search MedTerms:
http://www.medicinenet.com/script/main/art.asp?articlekey=11023
noun, Pathology. 1. a neurologic disorder marked by loss of the ability to understand written or printed language, usually resulting from a brain lesion or a congenital defect.
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Dyslexia, also known as reading disorder, is characterized by trouble with reading despite normal intelligence. Different people are affected to varying degrees.
https://en.wikipedia.org/wiki/Alexia_(condition)
Blindness may be caused by diseases of the lens, retina, or other eye structures; diseases of the optic nerve; or lesions of the visual cortex or pathways of the brain. A small number of infants are born blind, but far more people become blind during life.
http://medical-dictionary.thefreedictionary.com/Alexia+(disorder)
alexia in Medicine. alexia a·lex·i·a (ə-lěk'sē-ə) n. Loss of the ability to comprehend the meaning of written or printed words and sentences, usually caused by brain lesions. Also called text blindness, visual aphasia, word blindness.
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Also called optic alexia, sensory alexia, visual alexia, to differentiate from motor alexia (anarthria), in which there is loss of the power to read aloud even though the significance of what is written or printed is understood. Synonym(s): text blindness, word blindness, visual aphasia (1)
http://medical-dictionary.thefreedictionary.com/Alexia+(disorder)
alexia medical definition
The medical definition of Alexia is a loss of the ability to comprehend the meaning of written or printed words and sentences, usually caused by brain lesions. Alexia  medical definition is the loss of the ability to comprehend the meaning of written or printed words and sentences, usually caused by brain lesions. 