Prosopagnosia

Also called Face blindness

Difficulty recognising faces, including familiar ones. Affects around one person in fifty and is almost always mistaken for rudeness.

What it is

Difficulty or inability to recognise faces, despite normal vision and normal intelligence.

The developmental form is present from childhood, affects an estimated 2 per cent of people, and often runs in families. The acquired form follows stroke, brain injury or neurodegenerative disease.

Severity varies enormously. Some people cannot recognise close family or their own reflection; many can recognise people they know very well in expected contexts but fail completely when somebody appears out of context, has changed their hair, or is one of a group.

**The social cost is the whole of the condition.** Failing to greet a colleague, walking past a neighbour, or not recognising somebody met the week before is read as arrogance, coldness or lack of interest, and people acquire a reputation they cannot correct because they do not know it is happening.

Many people with it never realise it is a recognised condition, and assume they are simply bad with people. There is no treatment, and the effective response is entirely about strategies and about telling people.

It is more common in autistic people, though most people with prosopagnosia are not autistic.

An online test, developed for research, allows people to check, and the diagnosis mainly matters because it gives an explanation and permission to tell others.

Signs you might notice

Failing to recognise familiar people out of context.

Relying on hair, voice, gait, glasses, clothing or a distinctive feature rather than the face.

Difficulty following films and television because characters cannot be told apart.

Not recognising oneself in photographs or mirrors, in severe cases.

Anxiety in social and work settings, and avoidance of them.

Being told one is aloof, rude or forgetful.

In children: difficulty making friends, distress at school, and appearing not to recognise teachers or classmates.

Urgent, and different: a sudden loss of the ability to recognise faces in an adult, which suggests stroke or another acute brain problem and needs same-day assessment.

Also assess: progressive difficulty recognising people alongside other cognitive change, which may be dementia.

How it can affect day-to-day life

The single most effective strategy is telling people. A short explanation, given once, prevents years of being thought rude, and most people respond well.

Practical workarounds: asking others to say their name when they approach, memorising non-facial features, using context deliberately, and asking colleagues to keep a consistent look in the early weeks of a job.

Photographs with names, and seating plans, help in workplaces and schools.

Children need it recognised at school, or they are labelled as unfriendly, and they need to be given permission to ask names.

Video calls with names displayed are often easier than in-person meetings, which is a small but genuine advantage.

For acquired prosopagnosia after brain injury, rehabilitation focuses on the same compensatory strategies, and the emotional impact of losing the ability to recognise family is profound and needs support.

Colleagues, teachers and care staff who understand it can change the experience entirely by simply announcing themselves.

Supporting someone well

Tell people, in a short matter-of-fact sentence. It solves most of the social problem.

Ask people to say their name when they approach, and do the same for others.

Use non-facial cues deliberately: voice, gait, hair, glasses, habitual clothing, context.

Use photographs with names, seating plans and name badges at work and school.

Tell schools, so a child is not labelled unfriendly.

Say your name when you approach somebody with prosopagnosia; it costs nothing.

Get sudden onset in an adult assessed the same day.

Ask for cognitive assessment where it is progressive or accompanied by other changes.

Ask for support with the anxiety and avoidance that often accompany it.

Where to get help

A GP practice for assessment, particularly for sudden or progressive onset.

Neuropsychology for formal assessment after brain injury.

Headway on 0808 800 2244 for acquired forms after brain injury.

National Autistic Society where it occurs alongside autism.