International Multi-centre, Prospective, Longitudinal Cohort to Evaluate the Progression Pattern of Choroidal Venous Alterations

Recruiting

• Conditions: Pachychoroid Disease

• Registration Number: NCT07236671
• Lead Sponsor: Singapore National Eye Centre

Brief Summary

This study is about understanding how a condition called pachychoroid changes over time. Pachychoroid refers to an anatomic choroidal characteristic with abnormally thick choroid or abnormally dilated Haller's vessels. Pachychoroid can range from mild forms which does not cause any problems to more serious ones that might cause vision loss.This study will recruit participants with pachychoroid, to learn more about how this condition develops, how it affects people in the long run, and what factors might make it worse.

Detailed Description

This study aims to document the longitudinal progression pattern and the incidence rate of progression of choroidal venous alteration (defined as either an increase in number of quadrants with pachyvessels or formation of new anastomoses which violates the physiological watershed It will provide valuable natural history data to study the pattern of evolution of choroidal vessels over time and validate the proposed multi-hit theory over a period of three years.

Study Timeline

• Study Start: 2025-03-04
• Status Verified: 2025-11
• Study First Submitted: 2025-11-14
• Study First Submitted QC: 2025-11-14
• Last Update Submitted: 2025-11-14
• Study First Posted: 2025-11-19
• Last Update Posted: 2025-11-19
• Primary Completion: 2029-06
• Study Completion: 2029-08-01

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 250

Inclusion Criteria

1. Adults aged 45 years or older.
2. Presence of pachyvessels on ultra-widefield (UWF) imaging in at least one quadrant.
3. Willing to undergo pupil dilation, and protocol-required procedures for both eyes
4. Willing to provide written informed consent

Exclusion Criteria

1. Presence of disorders of the ocular media which interfere with visual acuity and other ocular assessments during the study period
2. Eyes with other ocular pathology such as trauma, inflammation, previous intraocular surgery (except for cataract surgery)
3. Systemic diseases that might affect ocular blood flow such as uncontrolled hypertension, autoimmune disease, and haematological disorders
4. Pregnant or nursing women
5. Persons who are unable to give informed consent

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
To document the longitudinal progression pattern and the incidence rate of progression of choroidal venous alteration (defined as either an increase in number of quadrants with pachyvessels or formation of new anastomoses which violates the physiological	3 years

Trial Locations

Locations (4)

Hong Kong University; 🇭🇰 Hong Kong, Hong Kong

University of Malaya Medical Centre; 🇲🇾 Kuala Lumpur, Malaysia

National University Hospital, Singapore; 🇸🇬 Singapore, Singapore

Singapore National Eye Centre/ Singapore Eye Research Institute; 🇸🇬 Singapore, Singapore