An inability to comprehend the meaning of written or printed words and sentences, caused by a cerebral lesion. Also called optical alexia, sensory alexia, or visual alexia, in distinction to motor alexia (anarthria), in which there is loss of the power to read aloud although the significance of what is written or printed is understood. Syn: text blindness, word blindness, visual aphasia(1).
[G. a- priv. + lexis, a word or phrase]