"Halos" are a often described symptom of<unk>  Typical symptoms of the<unk>  include: halos or auras surrounding objects, trails following objects in motion, difficulty distinguishing between colors, apparent shifts in the hue of a given item, the illusion of movement in a static setting, visual snow, distortions in the dimensions of a perceived object, intensified hypnagogic & hypnopompic hallucinations, and a heightened awareness of floaters. The visual alterations experienced by those with<unk>  are not homogeneous and there appear to be individual differences in both the number and intensity of symptoms. Visual aberrations can occur periodically in healthy individuals – e.g. afterimages after staring at a light, noticing floaters inside the eye, or seeing specks of light in a darkened room. However, in people with<unk> , symptoms are typically persistent enough that the individual cannot ignore them. There is some uncertainty about to what degree visual snow constitutes a true<unk>  symptom. There are many individuals who have never used a drug which could have caused the onset, but yet experience the same grainy vision reported by<unk>  sufferers. There are a few potential reasons for this, the most obvious of which being the theory that the drug usage may exaggerate the intensity of visual snow. Visual Snow with additional geometric hallucinations Another theory is that instead, there may be no change in the severity or magnitude of the visual snow, but perhaps the drug usage opens sensory pathways that result in the individual becoming more aware of any visual disturbances that may have simply not been noticed before the incidence of substance use. As for root cause of visual snow, some theories suggest that it is the result of thermal noise in the visual cortex or in the 'Optic Pathway' as eye tests for individuals who experience visual snow often reveal that physically, the eye is perfectly normal, and in many cases the individual still maintains 20/20 vision.<unk>  usually has a visual manifestation. Drugs affecting the auditory sense, like diisopropyltryptamine (DiPT), may produce auditory disturbances, though there are few known cases. Some<unk> ic substances can produce temporary tinnitus-like symptoms as a side effect. According to a 2016 review, there are two theorized subtypes of the condition. Type 1<unk>  is where people experience random, brief flashbacks. Type 2<unk>  entails experiencing persistent changes to vision, which may vary in intensity. This model has faced scrutiny however due to "flashbacks" often being considered a separate affliction and not always a perceptual one.
Hallucinogen persisting perception disorder
Pollutant-induced abnormal behaviour
Prescription drug addiction
Body substance isolation
Psychedelic microdosing
Long-term effects of cannabis
Bullying in medicine
Effects of meditation