Visual hallucinations in the elderly: understanding, assessing, and responding in Nursing home
📑 Table of contents
- What is a visual hallucination? Definitions and distinctions
- Frequency and impact in Nursing home
- The main causes of visual hallucinations in the elderly
- DCL: the neurological hallucinatory signature
- Medications and hallucinations: the iatrogenic trap
- Delirium and acute confusion: the urgency not to miss
- Charles Bonnet syndrome: seeing without being crazy
- Assessing hallucinations in Nursing home: a 5-step approach
- Responding to hallucinations: practical approaches for the team
- Informing and supporting families
“ There is a child in my room. ” “ Black cats on my bed. ” “ A man standing in the hallway is watching me. ” These phrases are regularly heard by Nursing home teams. In response, the reactions are often the same: denial (“ there is nothing ”), concern (“ he is delirious ”), or quick recourse to the doctor for an antipsychotic prescription. Rarely is there a structured clinical approach seeking to understand why this resident sees what he sees.
Visual hallucinations in the elderly in Nursing homes are, however, a symptom rich in information. Their nature, content, context of appearance, and the resident's reaction often allow for differentiating a chronic neurological cause from a reversible iatrogenic cause, an acute delirium, or an unknown sensory disorder. This distinction is clinically crucial: it conditions the therapeutic response, with major safety stakes in certain pathologies like DCL.
This guide provides you with the tools to observe, assess, and respond to visual hallucinations methodically — without rushing to antipsychotics, nor minimizing dangerously.
1. What is a visual hallucination? Definitions and distinctions
A hallucination is a perception without an object: the brain generates a sensory experience — visual, auditory, olfactory, tactile — without any corresponding external stimulus. The person “ really sees ” something that others do not see: it is not simulation or exaggeration.
It is important to distinguish hallucinations from several neighboring phenomena that resemble them but have different causes and implications. An illusion is a distortion of a real stimulus (mistaking a coat hanging for a person): it is very common in dementias and confusional states, and does not necessarily mean a true hallucination. An eidetic image is the persistence of a visual image perceived after the stimulus has disappeared, without pathological character. An intrusive memory is a mental image from memory, which the person knows is not real. These distinctions have practical implications for assessment.
Hallucinations can be elementary (lights, shapes, colors without meaning — often of ophthalmological or occipital origin) or complex (people, animals, entire scenes — of more elaborate cortical origin). Complex hallucinations are the most frequent in Nursing homes and the most clinically informative.
💡 Hallucination vs illusion: a practical distinction. In a Nursing home, it is common for a resident to confuse a coat hanging on the door for an intruder, or the folds of a curtain for a face. These are illusions — misinterpretations of a real stimulus. They indicate a perceptual disorder or a cortical processing deficit, but are less diagnostically specific than true hallucinations. An attentive caregiver can often resolve them simply by turning on the light or showing the real object to the resident.
2. Frequency and impact in Nursing homes
Visual hallucinations are a common symptom in Nursing homes, underreported and undervalued. Studies estimate their prevalence at 15 to 30% of demented residents, with significant variations depending on the type of dementia: 60 to 70% in DLB, 20 to 30% in moderate to severe Alzheimer's, 10 to 15% in vascular dementia, and episodically in many other pathologies.
Underreporting is massive for several reasons. Many residents, aware that their visions seem abnormal, do not spontaneously report them for fear of being judged "crazy." Others no longer have the verbal capacity to describe them. And some caregivers minimize reports of hallucinations by attributing them to dementia in general, without seeking to analyze them more finely.
The impact of hallucinations on quality of life is variable. Some hallucinations are neutral or even pleasant for the resident — who coexists peacefully with their "visitors." Others are a source of intense anxiety, agitation behaviors, insomnia, and refusal of care. It is the emotional tone of the hallucinations, much more than their mere presence, that determines the level of urgency of the clinical response.
3. Major causes of visual hallucinations in the elderly
Visual hallucinations in the elderly in Nursing homes are not all the same nor all of neurological origin. Several major categories of causes must be systematically considered during evaluation.
| Cause | Mechanism | Characteristics of hallucinations | Urgency |
|---|---|---|---|
| Lewy body dementia (DLB) | Dysfunction of cortical visual pathways (occipital Lewy bodies) | Complex, recurrent, early, minimally anxiety-provoking, people or animals | Moderate — chronic |
| Alzheimer's disease | Affectation of associative visual cortices in moderate to severe stages | Variable, often linked to the emotional content of the moment | Low if non-anxiety-provoking |
| Medications (iatrogenesis) | Anticholinergic, dopaminergic, or sedative effects | Appearance after the introduction of a medication, often concerning | High — reversible |
| Delirium (acute confusion) | Acute brain dysfunction (infection, dehydration, pain…) | Sudden onset, fluctuating, associated with confusion and agitation | Very high — emergency |
| Charles Bonnet syndrome | Visual sensory deprivation (AMD, severe cataract) | Complex, elaborate, preserved critical awareness, non-anxiety-provoking | Low — benign |
| Psychiatric disorder | Late-onset psychosis, psychotic depression | Often persecutory, associated with coherent delusional themes | Moderate — psychiatric evaluation |
| Temporal/occipital epilepsy | Epileptic discharges from visual cortices | Brief, stereotyped, elementary (lights, shapes), repetitive | High — neurological assessment |
4. DLB: the neurological hallucinatory signature
In Lewy body dementia, visual hallucinations have a very characteristic clinical signature that distinguishes them from all other causes. Recognizing them allows for guiding the diagnosis and immediately adopting the necessary medication precautions.
Distinctive characteristics of DLB hallucinations
DLB hallucinations are complex and detailed: the resident sees whole people, animals, children, sometimes moving scenes. They describe them with precision and coherence ("it's an old man in a gray suit, he is sitting in the armchair"). They are recurrent and stereotyped: the same characters return, in the same places, at similar times. They are early in the disease's progression, sometimes before any notable cognitive decline. And they are often minimally anxiety-provoking: the resident can describe them calmly, sometimes with humor ("the gentleman is still here"), maintaining a certain critical distance.
Partial critical awareness is an important element: many DLB patients know that others do not see what they see, even if they cannot help but see it. This partial detachment distinguishes DLB hallucinations from hallucinations in psychosis or delirium, where the conviction of reality is total.
The neurological mechanism
Visual hallucinations in DLB are generated by Lewy bodies in the associative occipital and parietal visual cortices. These regions, normally responsible for interpreting and recognizing visual objects, spontaneously generate complex visual percepts in the absence of stimuli. It is a phenomenon analogous to "background noise" in the visual circuits — the brain "invents" images because its visual processing circuits are functioning abnormally.
This mechanical understanding is liberating for caregivers and families: DLB hallucinations are not a sign of "madness," not a reaction to a traumatic situation, not a psychiatric delirium. They are neurological artifacts — bothersome but biologically explainable.
« Ms. Tissot told me this morning that there were three little girls playing in her room. She smiled and asked me if they were coming to see me too. She knew they weren't. She said to me 'it's my illness, I know'. I found that both sad and beautiful. »
5. Medications and hallucinations: the iatrogenic trap
The drug-related cause of visual hallucinations is probably the most underdiagnosed in nursing homes — and yet one of the most easily reversible. Many classes of medications commonly prescribed for elderly people can trigger or worsen visual hallucinations.
The most involved medications
The anticholinergic medications are the first class to monitor : oxybutynin (Ditropan), certain antihistamines, tricyclic antidepressants, certain antiemetics. By blocking central muscarinic receptors, they disrupt the circuits regulating consciousness and perception, potentially triggering hallucinations, especially at night.
The dopaminergic medications anti-Parkinson (L-Dopa, dopaminergic agonists like pramipexole or ropinirole) are frequently associated with visual hallucinations, especially at high doses or with rapid introduction. In the context of a PSP or a DCL, this risk is further increased by the vulnerability of subcortical dopaminergic circuits.
The corticosteroids at high doses and opioids can also trigger hallucinations, as can benzodiazepines during abrupt withdrawal. The antibiotics from the quinolone family (ciprofloxacin, levofloxacin), often prescribed for frequent urinary infections in nursing homes, are an underrecognized cause of confusion and hallucinations in fragile elderly people.
The sign of chronology
The golden rule for suspecting a drug-related cause is chronology : hallucinations that appear in the days or weeks following the introduction or increase of a medication should always suggest an iatrogenic cause. Documenting the date of introduction of each new medication in the care record is a simple gesture that can prevent a cascade of unnecessary prescriptions.
A resident develops hallucinations after the introduction of an anticholinergic medication for urinary incontinence. The on-call doctor, unaware of the recent treatment, prescribes an antipsychotic for the hallucinations. The antipsychotic worsens confusion and hallucinations (especially if DCL). A new molecule is added. The vicious circle is set in motion.
When faced with new hallucinations, first look for a medication-related cause: review the list of treatments, check recent introductions, alert the coordinating doctor with the precise timeline. Stopping or substituting the suspected medication is often sufficient to make the hallucinations disappear without resorting to antipsychotics.
6. Delirium and acute confusion: the emergency not to be missed
Delirium — also called acute confusional syndrome or acute confusional state — is a medical emergency that can include visual hallucinations in its clinical picture. Recognizing it quickly is vital because its underlying causes (infection, dehydration, pain, intestinal obstruction, Stroke) require immediate treatment.
The distinctive signs of delirium
Delirium is distinguished from chronic neurological hallucinations by several characteristics. It has a sudden or subacute onset (from a few hours to a few days), often without a hallucinatory history in this resident. It is accompanied by a global alteration of consciousness — very fluctuating attention, major disorientation, incoherence of thoughts. The hallucinations are anxiety-inducing and persecutory, often associated with intense agitation. There is an identifiable underlying cause in the vast majority of cases.
The CAM confusion score (Confusion Assessment Method) is a simple and validated tool that nursing home teams can use to identify delirium. It is based on four criteria: acute onset and fluctuation, inattention, disorganized thinking, and altered level of consciousness. The presence of the first two criteria plus one of the last two indicates a probable delirium.
Causes to look for urgently
When faced with delirium with hallucinations, the causes to look for immediately are: an infection (urinary, pulmonary, skin — the most common), dehydration, unexpressed pain (unknown fracture, urinary retention, fecal impaction), metabolic disturbance (hypoglycemia, hyponatremia, hypercalcemia), an iatrogenic cause (new medication, drug interaction), an acute neurological event (Stroke, epilepsy).
- Temperature and blood pressure — rule out an infection or hemodynamic disturbance
- Capillary blood sugar — eliminate hypoglycemia in a few seconds
- Urine dipstick — screen for a urinary infection, a common cause of delirium
- Hydration status — check the diuresis of the last 24 hours, dry mucous membranes
- Pain assessment — look for unexpressed pain (grimaces, pain-relieving positions)
- Review of recent treatments — look for a recent introduction or a change in dosage
- Immediate medical alert — always inform the doctor without delay
7. Charles Bonnet syndrome: seeing without being crazy
Charles Bonnet syndrome (CBS) is a common, benign, and extremely underrecognized cause of visual hallucinations in nursing homes. It affects people with severe visual impairment — AMD, advanced glaucoma, severe unoperated cataract, diabetic retinopathy — and manifests as complex visual hallucinations in individuals whose cognition and mental state are normal.
Mechanism and presentation
CBS is related to a phenomenon of sensory deprivation: when the brain receives less visual information due to a deficiency of the sensory organ, the visual cortices, deprived of their usual "nourishment," spontaneously generate replacement images. It is somewhat the visual equivalent of tinnitus — a "noise" generated by an insufficiently stimulated sensory system.
The hallucinations of CBS are characteristically elaborate and colorful: costumed characters, flowered gardens, animals, complex architectures. The resident knows they are not real — critical insight is intact — and speaks about them with a mix of astonishment and perplexity. They are not anxiety-inducing and often disappear when the person blinks or moves to a brighter place.
Why it is often confused with early dementia
Families and sometimes caregivers who learn that a resident sees imaginary people may mistakenly conclude that it is early dementia or psychosis. If the resident does not dare to report their hallucinations for fear of this judgment, they remain silent for months or years. CBS is a benign and treatable cause (improvement of visual correction, cataract surgery if possible, optimal lighting) that does not justify antipsychotics or psychiatric hospitalization.
💡 A simple question that makes a difference. Systematically asking the question “ Do you ever see things that others do not see ? ” during the initial assessment or during regular evaluations helps to detect the SCB and DCL hallucinations well before they become anxiety-inducing or sources of agitation. This simple question, integrated into the initial data collection, can change the diagnosis and care plan.
8. Assessing hallucinations in Nursing homes: a 5-step approach
When faced with a resident who reports visual hallucinations, or whose behaviors suggest unusual perceptions, a structured approach in five steps allows for quick orientation towards the right cause and the right response.
- Accurately describe the hallucinations. Since when ? At what time (day, night, upon waking) ? What content (people, animals, shapes, colors) ? What is the resident's reaction (calm, anxious, agitated) ? Does the resident think it is real or do they have partial awareness ? This information is recorded in the file with time and context.
- Look for an acute onset or recent triggering factor. Sudden onset = delirium to be urgently ruled out. Onset after a new medication = iatrogenic cause to explore. Hallucinations present for a long time and stable = likely chronic cause (DCL, Alzheimer's, SCB).
- Check basic vital and biological parameters. Temperature, blood pressure, blood sugar, diuresis, urine strip. These simple checks quickly rule out acute medical causes.
- Systematic medication review. List all ongoing medications with their introduction date. Identify molecules with anticholinergic, dopaminergic, sedative effects. Report to the coordinating physician any temporal correlation between medication introduction and the onset of hallucinations.
- Assess visual acuity and field. Severe uncorrected visual deficit points towards Charles Bonnet syndrome. Check if the resident is wearing their glasses, if their prescription is up to date, and if a known cataract has been treated.
9. Responding to hallucinations: practical approaches for the team
The response to hallucinations entirely depends on their identified cause. There is no universal strategy: what is suitable for benign hallucinations of a MCI is inappropriate for delirium, and vice versa.
For chronic neurological hallucinations (MCI, Alzheimer's disease)
Validation without confirmation is the reference approach. It involves acknowledging the emotional experience of the resident without engaging in the content of the hallucination: “I see that you are perceiving something. Does this worry you?” This approach reduces anxiety without creating additional confusion about reality.
Environmental adaptation reduces the frequency of hallucinations: uniform lighting without shadow areas (dark areas promote hallucinations), covered mirrors if the resident does not recognize themselves, a decluttered environment without objects that may be misidentified, and maintaining soft night lighting (nightlight). These simple adjustments can sometimes significantly reduce the frequency of episodes.
Reorientation through distraction — offering an activity, a change of space, music — can interrupt an anxiety-provoking hallucinatory episode without the need to argue about the reality of the visions.
For delirium with hallucinations
Delirium with hallucinations is a medical emergency whose treatment addresses the underlying cause. While waiting for medical intervention, the team ensures the physical safety of the resident (risk of falls, self-harm), maintains a reassuring and calm presence, reduces sensory stimulation (soft light, calm, one caregiver at a time), and avoids any confrontation about reality. Non-pharmacological interventions are prioritized; antipsychotics are only used as a last resort and on medical prescription, except for residents with MCI where they are contraindicated.
For Charles Bonnet syndrome
The main approach is psychoeducation: explaining to the resident and family what CBS is, reassuring them about the benignity of the phenomenon, normalizing the experience by giving it a name (“What you are seeing is called Charles Bonnet syndrome — it’s your brain creating images to compensate for your visual deficit”). Optimizing visual correction (appropriate glasses, strong contrast, optimal lighting) reduces the frequency of episodes. No antipsychotic is indicated.
📋 Summary table: respond according to the cause
- DCL — calm chronic hallucinations : validation without confirmation, adaptation of the environment, distraction — never neuroleptics
- Alzheimer — episodic hallucinations : validation, reorientation, adapt if anxiety-provoking — antipsychotics as a last resort
- Iatrogenic — suspected medication : alert the doctor for treatment reassessment — often reversible without adding medication
- Delirium — sudden onset + agitation : medical emergency — treat the cause — secure the environment
- Charles Bonnet — visual deficit + insight : psychoeducation, visual optimization — no antipsychotic
10. Inform and support families
For families, discovering that their loved one sees non-existent people or animals is often terrifying. The most common reaction is the belief that dementia is "suddenly worsening," or — more rarely — doubt about the reality of the visions ("maybe there really is something we don't see"). The team has an essential educational role in transforming this terror into understanding.
The neurological explanation — simple, concrete, devoid of technical jargon — reassures most families. Explaining that hallucinations are generated by dysfunctional brain circuits, like a "visual short circuit," and not by progressive madness or psychiatric decompensation, radically changes the family's perspective on the symptom.
Showing families how to respond concretely during an episode — not confronting, not engaging in the delusion, welcoming with empathy, offering a distraction — gives them an active role and relieves them of helplessness. A simple practical sheet ("What to do when he/she sees characters?") given to the family as soon as the first episodes appear is a valuable tool that can be written in a few minutes and can transform anxiety-provoking visits into moments of caring connection.
Mr. Picard, a moderately stable Alzheimer’s resident for 2 years, suddenly presents intense visual hallucinations (he sees insects on the walls and his bed), significant agitation, and refusal to eat within 48 hours. He had never experienced hallucinations before. The night nurse notes the behavior and reports it in the transmissions. A nursing assistant notices that a urinary infection was treated with ciprofloxacin 3 days earlier.
The coordinating nurse alerts the coordinating doctor who identifies ciprofloxacin as the probable cause (a quinolone known for its neuropsychiatric effects). The antibiotic is changed to amoxicillin. Mr. Picard's condition improves within 48 hours.
✅ Result : The hallucinations completely disappear within 4 days after the change of antibiotic. No antipsychotic was prescribed. The vigilance of the care team and the traceability of the medication introduction prevented a cascade of unnecessary prescriptions.
Mrs. Giraud, 87 years old, with no history of dementia, reports seeing colorful butterflies and children in costumes dancing in her room for the past 3 months. She smiles and specifies that she knows "it's in her head" but that it's very beautiful. Her daughter, alerted, thinks of early-stage dementia. The coordinating doctor is consulted and performs an ophthalmological assessment: severe bilateral AMD with very reduced visual acuity.
The diagnosis of Charles Bonnet syndrome is made. The daughter and the resident receive a complete explanation of the mechanism and the benign nature of the phenomenon. The lighting in the room is optimized. The resident is reassured and reports that her visions are less frequent since she knows what they are.
✅ Result: No antipsychotic prescribed. The daughter, reassured, no longer experiences visits with anxiety. Mrs. Giraud says she finds her butterflies "less overwhelming since they have a name." An ophthalmological consultation for anti-VEGF injection is scheduled.
🤝 The 10 reflexes of the team in response to visual hallucinations
- Precisely describe the hallucination in the file (content, time, context, resident's reaction)
- Look for an acute onset — if yes, treat as a medical emergency
- Check the list of medications introduced in the previous 2 weeks
- Systematically measure vital signs and capillary blood glucose
- Check visual acuity and glasses use (Charles Bonnet)
- Never confirm or deny the hallucinations — approach through validation
- Never rush the prescription of antipsychotics without an etiological diagnosis
- Never give classic neuroleptics without checking for the absence of DCL
- Adapt the environment (light, mirrors, visual stimulation)
- Train the family on appropriate responses during visits
Visual hallucinations are not a mysterious fate inherent to old age. They are neurological, medication-related, or sensory symptoms that have identifiable causes and appropriate responses. A Nursing home team trained to analyze them methodically — rather than responding reflexively or by default — offers its residents safer, more humane, and often more effective care.
🎓 Train your team on the assessment of visual hallucinations
The DYNSEO training on Alzheimer's-related diseases covers visual hallucinations in all their causes: DCL, iatrogenesis, delirium, Charles Bonnet. Clinical approach and practical response for the entire Nursing home team. Qualiopi certified.