Prosopagnosia which is also known as face blindness is a disorder of face perception where the ability to recognize faces is impaired. However, other aspects of visual processing and intellectual functioning remain intact. The term prosopagnosia orginally referred to a condition following acute brain damage (acquired prosopagnosia), but a congenital or developmental form of the disorder also exists. This disorder can affect up to 2.5% of the population. The specific area of the brain that is usually associated with prosopagnosia is called the fusiform gyrus, which is supposed to activate specifically in response to seeing different faces.
While looking online for information about Prosopagnosia I came across a youtube video about Prosopagnosia. The man in the video actually suffers from this disorder, and wrote a book about coping with the disorder. I have copied a link to the video below.