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Swiss naturalist and philosopher Charles Bonnet documents visual hallucination in his 87-year-old grandfather, Charles Lullin, who was nearly blind from cataracts. The condition, Charles Bonnet Syndrome (CBS) was formally named after its founder by George de Morsier in 1937. It occurs in individuals with significant vision loss (e.g., heavy cataracts, age-related macular degeneration) who remain cognizant they are hallucinating and take no action. CBS is believed to result from sensory deprivation and cortical processing imbalances; it is not associated with mental illness (Weatherby, et al.; Christoph, et al.).