Hallucinogen persisting perception disorder. This is caused by taking a hallucinogen and some of the visuals never go away such as lights trailing and static but are not limited to this. These visuals are not severve but as the name implies are persistant and may never go away. This condition is not to be confused with flashbacks which are much more intense but do not last for extended periods. Some people actually enjoy this while it makes a select few commit suicide.
After eating an entire sheet of acid Bob had HPPD for the rest of his life.
by Bryce Glotfelty November 13, 2007