Prosopagnosia, also known as face blindness, means you cannot recognise people's faces.
Face blindness often affects people from birth and is usually a problem a person has for most or all of their life. It can have a severe impact on everyday life.
Many people with prosopagnosia are not able to recognise family members, partners or friends.
They may cope by using alternative strategies to recognise people, such as remembering the way they walk or their hairstyle, voice or clothing.
But these types of strategies do not always work – for example, when a person with prosopagnosia meets someone in an unfamiliar location.