A. Blood-sample study — UCL and Moorfields Eye Hospital, London

Research contact: Dr. Lee Jones

This study investigates possible biological markers associated with CBS. Participation is described as a single hospital visit involving a blood sample and questionnaire.

• Eligibility described: age 18 or older, with CBS hallucinations at least weekly.

• Location: London, United Kingdom.

• Contact: lee.jones10@nhs.net

Source: Esme’s Umbrella research opportunities.

B. Visual imagination and sight impairment — Cardiff University

This anonymous, approximately 60-minute questionnaire study investigates visual imagination and why some people with sight loss experience visual hallucinations.

• Eligibility described: UK adults aged 18 or older certified as sight impaired or severely sight impaired.

• You do not necessarily need to have CBS.

• Recruitment information was updated in October 2025, with further publicity in 2026; current enrollment should be confirmed.

• Participant information: https://www.cardiff.ac.uk/documents/2885646-invitation-to-participate-in-research-on-visual-imagination-and-sight-impairment?utm_source=chatgpt.com