Charles Bonnet Syndrome: associations between psychosocial measures and visual hallucination characteristics in the visually impaired.

All visual hallucination attributes except level of control were associated with a combined mental health factor in CBS participants.

• 70 participants with self-reported CBS completed an online survey assessing hallucination attributes
• Hallucination attributes assessed included frequency, duration, emotional valence, distress, level of control, and impact on quality of life
• Higher mental health factor scores were associated with more frequent, longer lasting, more unpleasant, and more distressing hallucinations
• Higher mental health factor scores were also associated with a more negative impact of hallucinations on quality of life
• Level of control over hallucinations was the only attribute not associated with the mental health factor

The associations between hallucination attributes and mental health were independent of years of sight loss and years experiencing CBS.

• Regression models tested relationships between hallucination attributes and mental health controlling for age, sex assigned at birth, years of sight loss, years experiencing hallucinations, presence of migraine, and visual field loss
• These associations were described as 'independent of years of sight loss and CBS'
• Clinical factors were explicitly included as covariates to account for their potential influence on observed associations

Anxiety, depression, and loneliness were measured and combined into a single mental health factor for analysis.

• Anxiety and depression were measured using the Hospital Anxiety and Depression Scale (HADS)
• Loneliness was assessed using the University of California Los Angeles (UCLA) Loneliness Scale
• All three measures were combined as a 'mental health factor' for use in regression models
• The study included 70 participants with self-reported CBS who completed an online survey

The emotional response to CBS has previously been associated with negative affect, but this study extended the association to a broader range of hallucination attributes and psychological measures.

• Prior literature suggested a link between psychological measures and hallucination characteristics, specifically emotional response and negative affect
• This study investigated whether the association extends to a broader range of hallucination attributes and psychological measures
• The study found associations extending beyond emotional valence to frequency, duration, distress, and quality of life impact

The study has several methodological limitations including no control group, uneven demographic representation, small sub-group sample size, and reliance on self-reported data.

• The study did not include a control group of visually impaired participants without hallucinations
• There was uneven representation across age and gender with a small sample size for sub-group analysis
• The study relied on self-reported online data without clinical assessment
• Details of participants' medication use were not collected

The findings suggest greater clinical attention is required to identify CBS patients experiencing psychological difficulties to provide appropriate treatment and support.

• The authors concluded that 'greater clinical attention required to identify people with CBS who are experiencing psychological difficulties to help provide appropriate treatment and support'
• The study found mental health measures are 'linked to a wider range of CBS attributes than previously recognised'
• CBS is defined in this study as visual hallucinations in individuals with sight loss