This condition is characterized by a deficit in word reading, with a relative preservation of letter reading. Often there is a right homonymous hemianopsia and a color naming deficit. It is usually associated with damage of the left occipital lobe and the splenium of the corpus callosum. This suggests a disconnection between the left and right calcarine cortex and the left angular gyrus. The patient is usually able to write spontaneously, but not read what has been written.
Patients can often identify words spelled aurally.
Number reading may be preserved. The angular gyrus plays a critical role in alexias and agraphias. This condition results from damage to the left calcarine visual cortex. The following schematic I prepared illustrates this result. There are always motor and linguistic components to be assessed in agraphia.