People with prosopagnosia (face blindness), a form of visual agnosia, have difficulty distinguishing one person from another by their facial characteristics. Several of them have developed extensive home pages to explain this rare disorder and how they cope with it. Visitors should view personal homepages with the understanding that they do not represent professional sources of medical information.
This personal web site by Cecilia Burman discusses what prospagnosia is and what if feels like to have it. On one page, she shows how she uses the same techniques to recognize a face as non face-blind people use to recognize a stone or an elbow