Diagnosis is based on the symptom of not being able to read, but the patient still maintains visual acuity and the ability to write.[7] Patients often have right homonymous hemianopia due to left occipital lobe involvement.[5] Neuropsychometric testing may also be used to diagnose alexia without agraphia.[5] It is a performance-based method to evaluate cognitive function and can be used to assess brain damage, brain disease, and mental illness.[15]