Noun
HPPD (uncountable)
(clinical psychology) Initialism of hallucinogen persisting perception disorder.
Hallucinogen persisting perception disorder (HPPD) is characterized by a continual presence of visual disturbances similar to those generated by psychedelic substances. Source: Internet
The use of classic hallucinogens like peyote has been associated with the development of a persistent psychosis as well as a phenomenon known as hallucinogen persisting perceptual disorder (HPPD). Source: Internet
Several scientific journal articles have described the disorder. citation HPPD differs from flashbacks in that it is persistent and apparently entirely visual (although mood and anxiety disorders are sometimes diagnosed in the same individuals). Source: Internet