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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
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

Full criteria on ClinicalTrials.gov

Sites (65)

Sites in registry order. Pick your city on the disease page to sort them by distance.

SiteCityCountrySite status
Hospital Clínico San Carlos
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MadridSpainCompleted
Hospital Universitario de Navarra
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PamplonaSpainCompleted
Hospital Universitario Virgen De La Macarena
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SevillaSpainCompleted
Hospital Universitario Rio Hortega
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ValladolidSpainCompleted
Hospital Unviersitario Miguel Servet
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ZaragozaSpainCompleted
Hospital Clinico Universitario Lozano Blesa
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ZaragozaSpainCompleted
HKU Eye Centre
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Hong KongHong Kong SAR ChinaUnknown status
Chinese University of Hong Kong Eye Centre
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KowloonHong Kong SAR ChinaUnknown status
Jahn Ferenc Del-Pesti Korhaz es Rendelointezet
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BudapestHungaryCompleted
Semmelweis University
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Budapest VIIIHungaryCompleted
Central Hospital Of Northern Pest Military Hospital
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Budapest XIIIHungaryCompleted
Budapest Retina Associates Kft.
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Budapest XIIIHungaryCompleted
University of Debrecen
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DebrecenHungaryCompleted
Nozologen Kft.
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PécsHungaryCompleted
Vas Varmegyei Markusovszky Egyetemi Oktatokorhaz
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SzombathelyHungaryCompleted
Nethra Eye Hospital
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BengaluruIndiaUnknown status
L V Prasad Eye Institute
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BhubaneswarIndiaUnknown status
Amrita Institute of Medical Sciences & Research Centre
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KochiIndiaUnknown status
Sarakshi Netralaya
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NagpurIndiaUnknown status
ICARE Eye Hospital & Post Graduate Institute
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NoidaIndiaUnknown status
Shivam Retina Clinic and Eye Hospital
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SuratIndiaUnknown status
Changhua Christian Hospital
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ChanghuaTaiwanUnknown status
China Medical University Hospital
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TaichungTaiwanUnknown status
Taipei Veterans General Hospital
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TaipeiTaiwanUnknown status
Chang Gung Memorial Hospital
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TaoyuanTaiwanUnknown status
Retina Research Institute of Texas
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AbileneUnited StatesUnknown status
Southeast Retina Center
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AugustaUnited StatesUnknown status
Retina Consultants of Austin/Austin Research Center for Retina
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AustinUnited StatesUnknown status
Retina Consultants of Charleston
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BeaufortUnited StatesUnknown status
Retina-Vitreous Associates Medical Group
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Beverly HillsUnited StatesUnknown status
Midwest Eye Institute
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CarmelUnited StatesUnknown status
Velocity (Meridian) Clinical Research
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CincinnatiUnited StatesUnknown status
Texas Retina Associates
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DallasUnited StatesUnknown status
Rand Eye Institute
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Deerfield BeachUnited StatesUnknown status
Retina Associates
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ElmhurstUnited StatesUnknown status
The Retina Partners
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EncinoUnited StatesUnknown status
Verum Research, LLC
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EugeneUnited StatesUnknown status
Retina Center of Texas
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GrapevineUnited StatesUnknown status
Cumberland Valley Retina Consultants
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HagerstownUnited StatesUnknown status
Florida Retina Institute
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JacksonvilleUnited StatesUnknown status
Charleston Neuroscience Institute
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LadsonUnited StatesUnknown status
University Retina
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LemontUnited StatesUnknown status
Retina-Vitreous Surgeons of Central New York
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LiverpoolUnited StatesUnknown status
Piedmont Eye Center
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LynchburgUnited StatesUnknown status
Valley Retina Institute PA d.b.a. Gulf Coast Eye Institute
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McAllenUnited StatesUnknown status
MedEye Associates
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MiamiUnited StatesUnknown status
Retinal Consultants Medical Group
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ModestoUnited StatesUnknown status
Florida Retina Institute
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OrlandoUnited StatesUnknown status
Retina Care Specialists
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Palm Beach GardensUnited StatesUnknown status
California Eye Specialists Medical Group
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PasadenaUnited StatesUnknown status
Vision Research Solutions in Philadelphia
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PhiladelphiaUnited StatesUnknown status
Arizona Retina and Vitreous Consultants
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PhoenixUnited StatesUnknown status
Phoenix Retina Associates
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PhoenixUnited StatesUnknown status
Black Hills Regional Eye Institute
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Rapid CityUnited StatesUnknown status
Retina Consultants of Southern California
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RedlandsUnited StatesUnknown status
California Eye Specialists Medical Group
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RedlandsUnited StatesUnknown status
Retina Consultants of Minnesota
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Saint Louis ParkUnited StatesUnknown status
California Retina Consultants
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Santa MariaUnited StatesUnknown status
Retina Partners of Northwest Arkansas
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SpringdaleUnited StatesUnknown status
The Retina Institute
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St LouisUnited StatesUnknown status
East Florida Eye Institute
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StuartUnited StatesUnknown status
Tyler Retina Consultants
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TylerUnited StatesUnknown status
North Carolina Retina Associates
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Wake ForestUnited StatesUnknown status
Retina Group of New England
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WaterfordUnited StatesUnknown status
Strategic Clinical Research Group
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Willow ParkUnited StatesUnknown status

Related publications

This page is information, not medical advice. Discuss any trial with your doctor.