Pure alexia (also known as word blindness) is a symptom of brain lesions or damage in which sufferers can write but not read. Looking at a page of words the person cannot read or comprehend the words. Sufferers can write normally but can't read what they themselves have written. Individuals with pure alexia can understand and discern words that are spelled out verbally to them. This shows this condition is a problem with perception- they are able to comprehend the words but that the visual information is disrupted from reaching the brain.