hallucinogen persisting perception disorder
This image is an example of a visual trick that causes black dots to appear in the white intersected circles.
This is one way to describe HPPD(Hallucinogen Persisting Perception Disorder).
Although you know the black dots are not there, they appear anyway.
As an HPPDer, we experience false perception similar to this twenty-four hours a day.
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The symptoms of HPPD are difficult to describe.
If the reader has injested a hallucinogen in the past, HPPD can roughly be described as "being on a small dose of LSD without tripping."
It is particularly difficult when attempting to describe the complex visual phenomena; which is experienced by HPPDers; to a person who has no experience with hallucinogenic drugs.
Trippy Isn't It?!