Charles Bonnet syndrome is a condition in which someone with poor vision experiences visual hallucinations, or seeing things that aren’t there. It occurs in individuals who have lost a significant portion of their sight due to age-related macular degeneration, retinitis pigmentosa, glaucoma, or other conditions that affect vision. It may also arise after cataract surgery or after a stroke. Charles
Why Does Charles Bonnet Syndrome Develop?
Understanding what causes charles bonnet syndrome is essential for prevention and treatment. Research consistently shows that charles bonnet syndrome arises from a complex interplay of biological, psychological, and social factors — rarely from a single cause.
Core Causes and Triggers
Charles Bonnet syndrome is named for the 18th-century naturalist and philosopher Charles Bonnet, who first identified the condition in his elderly grandfather. The primary symptom of Charles Bonnet syndrome is visual hallucinations, though the exact nature of these hallucinations can vary. Some people may see repeating patterns of lines or shapes, while others may see more concrete objects—including people’s faces, animals, or trees. The images may be stationary or may move around. Some people have reported that their hallucinations appear in black and white, though this is not universally the
Biological Factors
Biological contributors to charles bonnet syndrome include:
- Genetics: Family history increases risk; certain genes influence vulnerability
- Brain chemistry: Neurotransmitter imbalances (serotonin, dopamine, norepinephrine) play key roles
- Brain structure: Differences in the prefrontal cortex, amygdala, and hippocampus are documented
- Physical health: Chronic illness, hormonal changes, and sleep disruption can trigger or worsen charles bonnet syndrome
Psychological Factors
- Early experiences: Childhood adversity, attachment disruption, and trauma shape psychological vulnerability
- Cognitive patterns: Negative thinking styles, perfectionism, and rumination increase risk
- Coping skills: Limited emotional regulation skills make charles bonnet syndrome more likely under stress
- Personality: Certain traits (neuroticism, harm avoidance) are associated with higher risk
Social and Environmental Factors
Environmental factors — including chronic stress, relationship problems, financial difficulty, and major life events — can trigger charles bonnet syndrome in vulnerable individuals.
What Triggers an Episode?
Even in people with predisposing factors, charles bonnet syndrome often requires a triggering event:
- Major life transitions (job loss, relationship breakdown, bereavement)
- Prolonged stress without adequate recovery
- Substance use or withdrawal
- Physical illness or injury
- Social isolation or conflict
Protective Factors
Not everyone with risk factors develops charles bonnet syndrome. Protective factors include: strong social support, effective coping skills, physical health maintenance, access to care, and psychological resilience built through prior challenges.