For people with severe vision loss, seeing things that aren't there can be a startling experience. Yet according to experts, these hallucinations are a recognized and often benign consequence of eye disease. The phenomenon, sometimes called Charles Bonnet syndrome, occurs when the brain fills in missing visual information with vivid images—ranging from people and flowers to abstract patterns.
Despite its prevalence among those with significant sight impairment, awareness remains low. Many sufferers may fear they are developing dementia or a psychiatric condition, when in fact the visions are a direct result of the eyes' failing to send signals to the brain. The hallucinations are typically brief, non-threatening, and do not indicate a worsening of the underlying eye disease.
Experts emphasize that while the experience can be frightening, it is not harmful. They advise patients to discuss their symptoms with a doctor to rule out other causes, but reassure that in most cases no treatment is needed. Simply knowing the condition is common and benign can ease anxiety and help people cope with the visions when they occur.