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Charles Bonnet Syndrome in Low Vision Patients (CBS)

28 de abril de 2026 atualizado por: Fondazione Policlinico Universitario Agostino Gemelli IRCCS

Charles Bonnet Syndrome (CBS): Prevalence and Characteristics of Visual Hallucinations. Psychological Profile of the Visually Impaired Patient With CBS

Among patients with chronic and degenerative ocular diseases that cause visual limitations, the presence of Charles Bonnet Syndrome (CBS) may be detected as a comorbidity. CBS is as a phenomenon of complex visual hallucinations occurring in individuals with reduced visual function, in the absence of cognitive alterations, psychiatric and/or neurological conditions. It is estimated that 15.8% of patients with age-related macular degeneration and 13.5% among glaucoma patients have CBS. Prevalence rates vary widely, and this may depend on inconsistent diagnostic criteria, variability in the questions used to determine if an individual has visual hallucinations, and the reluctance of people to admit to having strange visions for fear of being considered mentally ill. Visual hallucinations can be invasive and debilitating, compromising mental health, quality of life, and rehabilitation in visually impaired individuals. Patients may experience confusion, anxiety, anger, paranoia, and social isolation. Regarding psychological aspects, about a third of patients report experiencing distress and fear,higher anxiety and social dysfunction particularly during the initial onset of symptoms and in the terminal stage of the disease.Screening questionnaires will be used.

Visão geral do estudo

Status

Inscrevendo-se por convite

Condições

Síndrome de Charles Bonnet

Descrição detalhada

As part of our clinical practice, screening questionnaires will be used to assess the mental health and psychological profile of enrolled patients:

PHQ-9 (Patient Health Questionnaire): A 9-question tool for screening depression, with scores ranging from 0-27 to assess depression severity. Scores above 5 require referral to a clinical psychologist; scores 15+ suggest psychiatric evaluation.

GAD-7 (General Anxiety Disorder): A 7-item tool to screen for generalized anxiety disorder, with scores from 0-21. Scores 10+ require clinical psychologist referral, and 15+ indicate the need for psychiatric evaluation.

SCL-90R (Symptom Checklist-90): A 90-item questionnaire assessing a range of psychological symptoms, including depression, anxiety, and aggression, rated on a Likert scale from 0 to 4.

NEI VFQ25 (National Eye Institute Visual Function Questionnaire): A tool to assess the quality of life related to vision.

GSES (Generalized Self-Efficacy Scale):A 10-item scale to measure perceived self-efficacy and coping mechanisms for stressful life events, rated on a 4-point Likert scale.

PSS (Perceived Stress Scale):A tool to measure how individuals perceive their life as stressful, focusing on unpredictability, uncontrollability, and overwhelm.

GHQ-12 (General Health Questionnaire-12):A 12-item questionnaire to identify general mental health problems, focusing on the past two weeks.

Tipo de estudo

Observacional

Inscrição (Estimado)

640

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Locais de estudo

Itália
- - Roma, Itália, 00168
    - fondazione Policlinico Universitario A. Gemelli IRCCS, Polo Nazionale Ipovisione

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

Adulto
Adulto mais velho

Aceita Voluntários Saudáveis

N/D

Método de amostragem

Amostra de Probabilidade

População do estudo

Visually impaired individuals with central and peripheral defects who access the center for visual rehabilitation.

Descrição

Inclusion Criteria:

Best corrected visual acuity between 1/20 (1.0 LogMAR) and 3.2/10 (0.5 LogMAR) in cases of central vision impairment.
Residual binocular visual field ≤ 60% in cases of peripheral vision impairment.
Patients with age-related macular degeneration, Stargardt's disease, or glaucoma.
Age between 40 and 70 years.
Signed informed consent.

Exclusion Criteria:

Age under 40 years.
Clear cognitive impairments that reduce patient reliability.
Psychiatric disorders.
Refusal to sign informed consent to participate in the study.
Mental State Examination (MMSE) score below 22.

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado	Descrição da medida	Prazo
Prevalence of the Charles Bonnet Syndrome Prazo: From baseline through study completion, up to 24 months.	Prevalence of Charles Bonnet Syndrome, calculated as the ratio between the number of visually impaired patients affected by CBS and the total number of patients attending the visual rehabilitation center, multiplied by 100 (%).	From baseline through study completion, up to 24 months.

Medidas de resultados secundários

Medida de resultado	Descrição da medida	Prazo
Change in Generalized Anxiety Disorder-7 (GAD-7). 7 items score. Prazo: 3 hours	Scale range: 0 to 21 Interpretation: higher scores indicate a worse outcome (greater severity of anxiety symptoms) Cut-off: greater than 5	3 hours
Change in Patient Health Questionnaire-9 (PHQ-9). 9 Items score Prazo: 3 hours	Scale range: 0 to 27 Interpretation: higher scores indicate a worse outcome (greater severity of depressive symptoms) Cut-off: greater than 5	3 hours
Change in Symptom Checklist-90 (SCL-90) . 90 items score Prazo: 3 hours	Scale range: 0 to 4 (mean score across items) Interpretation: higher scores indicate a worse outcome (greater psychological distress) Cut-off: greater than 1.5	3 hours
Change in Eye Institute Visual Function Questionnaire-25 (NEI VFQ-25). 25 items score Prazo: 3 hours	Scale range: 0 to 100 Interpretation: higher scores indicate a better outcome (better visual function and quality of life) Cut-off: less than 60	3 hours
Change in General Self-Efficacy Scale (GSES) score. Prazo: 3 hours	Scale range: 10 to 40 Interpretation: higher scores indicate a better outcome (greater perceived self-efficacy) Cut-off: less than 30	3 hours
Change in Perceived Stress Scale (PSS) score. Prazo: 3 hours	Scale range: 0 to 40 Interpretation: higher scores indicate a worse outcome (greater perceived stress) Cut-off: less than 15	3 hours

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Fondazione Policlinico Universitario Agostino Gemelli IRCCS

Investigadores

Investigador principal: Stefania Fortini, MD, Fondazione Policlinico Universitario Agostino Gemelli IRCCS

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Real)

15 de janeiro de 2025

Conclusão Primária (Estimado)

31 de agosto de 2026

Conclusão do estudo (Estimado)

31 de janeiro de 2027

Datas de inscrição no estudo

Enviado pela primeira vez

20 de dezembro de 2024

Enviado pela primeira vez que atendeu aos critérios de CQ

28 de abril de 2026

Primeira postagem (Real)

1 de maio de 2026

Atualizações de registro de estudo

Última Atualização Postada (Real)