Johns Hopkins Center for Psychedelic and Consciousness Research:

Hallucinogen Persisting Perception Disorder (HPPD) Survey

Researchers at Johns Hopkins are conducting a survey to better understand the experiences of people with HPPD (Hallucinogen Persisting Perception Disorder). HPPD is a condition where people who have used hallucinogenic drugs experience ongoing visual disturbances, such as seeing halos around objects or seeing colors more vividly.

This survey will ask about risk factors, symptoms, treatment experiences, and how HPPD has impacted your life. Your participation in this research study can help improve our understanding of HPPD and lead to better treatment options for those who are affected by it. The survey takes approximately 30 minutes to complete and will be available through September 2023.

For more information or to enroll, visit:

This survey is carried out by: