What is Hallucinogen-persisting perception disorder?

What is Hallucinogen-persisting perception disorder?
     Symptoms
HPPD can affect the way a person perceives visual input.
According to a 2016 review, there are two types of the condition:
·         Type 1: This is where people experience HPPD in the form of random, brief flashbacks.
·         Type 2: People with this kind of HPPD experience ongoing changes to their vision, which may come and go.
The visual disturbances a person with HPPD may experience include:
·         seeing halos or auras around objects
·         seeing trails that follow moving objects
·         having trouble telling colours apart
·         the colour of an object seeming to change in hue
·         an object appearing to be moving when it is actually still
·         seeing a pattern on an object that others cannot see
·         air looking like it is grainy or textured often called visual snow
·         the dimensions of an object looking like they are changing
Experiencing the symptoms of HPPD can be distressing.

It is usually apparent to a person experiencing HPPD that they are not seeing things in the way they used to. This can be unnerving and may cause anxiety.

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