NCT05066997CompletedPhase 2/3
A Pivotal Safety and Efficacy Study of OCS-01 Eye Drops in Participants With Diabetic Macular Edema (DIAMOND 1)
A Phase 2/3 Double-Masked, Randomized, 2 Stage, Multicenter Study of the Efficacy and Safety of OCS-01 Eye Drops in Subjects With Diabetic Macular Edema
Source: ClinicalTrials.gov · Last updated 5 May 2026
Brief summary (registry, in English)
The primary objective of this study is to evaluate the efficacy and safety of the topical ophthalmic administration of OCS- 01 as compared to Vehicle in participants with Diabetic Macular Edema (DME).
- Status (registry)
- Completed
- Phase (registry)
- Phase 2/3
- Study type
- Interventional
- Enrollment
- 552 (actual)
- First submitted
- 2 Sept 2021
- Start date
- 19 Oct 2021
- Primary completion date
- 10 Apr 2026
- Lead sponsor
- Oculis
- Diseases
- Diabetic eye disease
- NCT number
- NCT05066997
- EU CT number
- 2023-507208-30-00
- EudraCT number
- 2021-005173-95
What you commit to
- Study type: Interventional · Phase 2/3
- Participants enrolled: 552
- From 19 Oct 2021 to the primary completion date, 10 Apr 2026
- 65 sites in 6 countries
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Other illness
- Have a known history of significant macular ischemia which would prevent gain in visual acuity in the study eye.
Other
- Have macular edema considered to be because of a cause other than DME.
- Have a decrease in BCVA because of causes other than DME.
Who the study is looking for
- Have a signed informed consent form before any study-specific procedures are performed.
- Have DME with presence of intraretinal and/or subretinal fluid in the study eye, with central subfield thickness (CST) of ≥310 µm by SD-OCT at screening (Visit 1) (as assessed by an independent reading center).
- Have a documented diagnosis of type 1 or type 2 diabetes mellitus at Visit 1 (Screening).
- Have a signed informed consent form before any study-specific procedures are performed.
- Have DME with presence of intraretinal and/or subretinal fluid in the study eye, with central subfield thickness (CST) of ≥310 µm by SD-OCT at screening (Visit 1) (as assessed by an independent reading center).
- Have a documented diagnosis of type 1 or type 2 diabetes mellitus prior to Visit 1 (Screening).
Age in the registry: 18 years to 85 years · Sex: All · Does not accept healthy volunteers
Sites (65)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| Hospital Clínico San Carlos Coordinator of this site? Confirm its status | Madrid | Spain | Completed |
| Hospital Universitario de Navarra Coordinator of this site? Confirm its status | Pamplona | Spain | Completed |
| Hospital Universitario Virgen De La Macarena Coordinator of this site? Confirm its status | Sevilla | Spain | Completed |
| Hospital Universitario Rio Hortega Coordinator of this site? Confirm its status | Valladolid | Spain | Completed |
| Hospital Unviersitario Miguel Servet Coordinator of this site? Confirm its status | Zaragoza | Spain | Completed |
| Hospital Clinico Universitario Lozano Blesa Coordinator of this site? Confirm its status | Zaragoza | Spain | Completed |
| HKU Eye Centre Coordinator of this site? Confirm its status | Hong Kong | Hong Kong SAR China | Unknown status |
| Chinese University of Hong Kong Eye Centre Coordinator of this site? Confirm its status | Kowloon | Hong Kong SAR China | Unknown status |
| Jahn Ferenc Del-Pesti Korhaz es Rendelointezet Coordinator of this site? Confirm its status | Budapest | Hungary | Completed |
| Semmelweis University Coordinator of this site? Confirm its status | Budapest VIII | Hungary | Completed |
| Central Hospital Of Northern Pest Military Hospital Coordinator of this site? Confirm its status | Budapest XIII | Hungary | Completed |
| Budapest Retina Associates Kft. Coordinator of this site? Confirm its status | Budapest XIII | Hungary | Completed |
| University of Debrecen Coordinator of this site? Confirm its status | Debrecen | Hungary | Completed |
| Nozologen Kft. Coordinator of this site? Confirm its status | Pécs | Hungary | Completed |
| Vas Varmegyei Markusovszky Egyetemi Oktatokorhaz Coordinator of this site? Confirm its status | Szombathely | Hungary | Completed |
| Nethra Eye Hospital Coordinator of this site? Confirm its status | Bengaluru | India | Unknown status |
| L V Prasad Eye Institute Coordinator of this site? Confirm its status | Bhubaneswar | India | Unknown status |
| Amrita Institute of Medical Sciences & Research Centre Coordinator of this site? Confirm its status | Kochi | India | Unknown status |
| Sarakshi Netralaya Coordinator of this site? Confirm its status | Nagpur | India | Unknown status |
| ICARE Eye Hospital & Post Graduate Institute Coordinator of this site? Confirm its status | Noida | India | Unknown status |
| Shivam Retina Clinic and Eye Hospital Coordinator of this site? Confirm its status | Surat | India | Unknown status |
| Changhua Christian Hospital Coordinator of this site? Confirm its status | Changhua | Taiwan | Unknown status |
| China Medical University Hospital Coordinator of this site? Confirm its status | Taichung | Taiwan | Unknown status |
| Taipei Veterans General Hospital Coordinator of this site? Confirm its status | Taipei | Taiwan | Unknown status |
| Chang Gung Memorial Hospital Coordinator of this site? Confirm its status | Taoyuan | Taiwan | Unknown status |
| Retina Research Institute of Texas Coordinator of this site? Confirm its status | Abilene | United States | Unknown status |
| Southeast Retina Center Coordinator of this site? Confirm its status | Augusta | United States | Unknown status |
| Retina Consultants of Austin/Austin Research Center for Retina Coordinator of this site? Confirm its status | Austin | United States | Unknown status |
| Retina Consultants of Charleston Coordinator of this site? Confirm its status | Beaufort | United States | Unknown status |
| Retina-Vitreous Associates Medical Group Coordinator of this site? Confirm its status | Beverly Hills | United States | Unknown status |
| Midwest Eye Institute Coordinator of this site? Confirm its status | Carmel | United States | Unknown status |
| Velocity (Meridian) Clinical Research Coordinator of this site? Confirm its status | Cincinnati | United States | Unknown status |
| Texas Retina Associates Coordinator of this site? Confirm its status | Dallas | United States | Unknown status |
| Rand Eye Institute Coordinator of this site? Confirm its status | Deerfield Beach | United States | Unknown status |
| Retina Associates Coordinator of this site? Confirm its status | Elmhurst | United States | Unknown status |
| The Retina Partners Coordinator of this site? Confirm its status | Encino | United States | Unknown status |
| Verum Research, LLC Coordinator of this site? Confirm its status | Eugene | United States | Unknown status |
| Retina Center of Texas Coordinator of this site? Confirm its status | Grapevine | United States | Unknown status |
| Cumberland Valley Retina Consultants Coordinator of this site? Confirm its status | Hagerstown | United States | Unknown status |
| Florida Retina Institute Coordinator of this site? Confirm its status | Jacksonville | United States | Unknown status |
| Charleston Neuroscience Institute Coordinator of this site? Confirm its status | Ladson | United States | Unknown status |
| University Retina Coordinator of this site? Confirm its status | Lemont | United States | Unknown status |
| Retina-Vitreous Surgeons of Central New York Coordinator of this site? Confirm its status | Liverpool | United States | Unknown status |
| Piedmont Eye Center Coordinator of this site? Confirm its status | Lynchburg | United States | Unknown status |
| Valley Retina Institute PA d.b.a. Gulf Coast Eye Institute Coordinator of this site? Confirm its status | McAllen | United States | Unknown status |
| MedEye Associates Coordinator of this site? Confirm its status | Miami | United States | Unknown status |
| Retinal Consultants Medical Group Coordinator of this site? Confirm its status | Modesto | United States | Unknown status |
| Florida Retina Institute Coordinator of this site? Confirm its status | Orlando | United States | Unknown status |
| Retina Care Specialists Coordinator of this site? Confirm its status | Palm Beach Gardens | United States | Unknown status |
| California Eye Specialists Medical Group Coordinator of this site? Confirm its status | Pasadena | United States | Unknown status |
| Vision Research Solutions in Philadelphia Coordinator of this site? Confirm its status | Philadelphia | United States | Unknown status |
| Arizona Retina and Vitreous Consultants Coordinator of this site? Confirm its status | Phoenix | United States | Unknown status |
| Phoenix Retina Associates Coordinator of this site? Confirm its status | Phoenix | United States | Unknown status |
| Black Hills Regional Eye Institute Coordinator of this site? Confirm its status | Rapid City | United States | Unknown status |
| Retina Consultants of Southern California Coordinator of this site? Confirm its status | Redlands | United States | Unknown status |
| California Eye Specialists Medical Group Coordinator of this site? Confirm its status | Redlands | United States | Unknown status |
| Retina Consultants of Minnesota Coordinator of this site? Confirm its status | Saint Louis Park | United States | Unknown status |
| California Retina Consultants Coordinator of this site? Confirm its status | Santa Maria | United States | Unknown status |
| Retina Partners of Northwest Arkansas Coordinator of this site? Confirm its status | Springdale | United States | Unknown status |
| The Retina Institute Coordinator of this site? Confirm its status | St Louis | United States | Unknown status |
| East Florida Eye Institute Coordinator of this site? Confirm its status | Stuart | United States | Unknown status |
| Tyler Retina Consultants Coordinator of this site? Confirm its status | Tyler | United States | Unknown status |
| North Carolina Retina Associates Coordinator of this site? Confirm its status | Wake Forest | United States | Unknown status |
| Retina Group of New England Coordinator of this site? Confirm its status | Waterford | United States | Unknown status |
| Strategic Clinical Research Group Coordinator of this site? Confirm its status | Willow Park | United States | Unknown status |
Related publications
This page is information, not medical advice. Discuss any trial with your doctor.