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| |Classification and external resources| Alexia (Alexia from
the Greek ἀ, privative, expressing negation, and λέξις =
"word"), or acquired dyslexia, occurs when damage to the brain
causes a patient to lose the ability to read. It is also called
word blindness, text blindness or visual aphasia. Those who
suffer from "alexia" and "developmental dyslexia" can have
similar difficulties, however, "alexia" refers to an acquired
reading disability, where reading ability had previously been
developed, usually occurring in adulthood conditions, while
"developmental dyslexia" refers to developmental reading
disability. There are two groups of alexia. - The first or main
group is "the central dyslexia" group which includes surface
dyslexia, semantic dyslexia, phonological dyslexia, and deep
dyslexia. - The second group, "the peripheral dyslexia" group,
includes neglect dyslexia, attentional dyslex