There are some weird things that you will come across with, one way or another. As I watch Today Weekend, I have learned something about a health condition called prosopagnosia or simply the face blindness which is the inability to recognize faces even if they have encountered those persons a number of times. The persons include their family members, friends or even themselves. It is not categorized though as memory impairment problem.
There are two types of prosopagnosia:
Developmental prosopagnosia is one that is present since childhood. A child does not recognize faces as well as other people do. On the other hand, acquired prosopagnosia may occur after brain damage from head injury, stroke, or neurodegenerative diseases. Individuals with this type had normal face recognition abilities in the past, but this has been impaired or lost due to brain injury. (source: raredisease.about.com)
Right now, there is no cure for this rare disease. Like the woman suffering from this disorder that I saw on Today Weekend, she learned other ways of remembering people around her particularly her kids. She remembers the clothes they wear for that day. That way, she will have an aide in knowing who her kids are when she picks them up from school. Other clues are hair, gait and voice.