Hallucinations related to sensory deprivation include visual hallucinations with visual impairment and musical hallucinations with auditory impairment. In studies of those with visual disorders, 6.3%–13% report visual hallucinations, often beginning with a sudden decrease in vision. Studies of comparison subjects undergoing visual sensory deprivation reveal that 19%–77% develop visual hallucinations, highlighting the role of sensory deprivation in the development of visual hallucinations.