"Visual hallucinations" refers to seeing things that aren't actually there. It is when someone sees images or objects that others cannot see, often caused by the brain playing tricks on the person's eyes. Full definition
«This suggests that disconnection of these brain areas may contribute to the generation of visual hallucinations in patients with Parkinson's disease.» (sciencedaily.com)
The disconnected brain areas seen on functional MRI (fMRI) may be valuable in predicting the development of visual hallucinations in patients with Parkinson's disease. (sciencedaily.com)
Based on the «prisoner's cinema,» or a phenomenon reported by prisoners in which people exposed to darkness for a long time experience visual hallucinations, «Criminal's Cinema» includes art that challenges our powers of perception by presenting warped, distorted, and shifting forms. (bushwickdaily.com)