{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Color+vision&page=3",
    "query": {
      "intervention": "Color vision",
      "page": 3
    },
    "page_size": 10
  },
  "pagination": {
    "page": 3,
    "page_size": 10,
    "total_count": 53,
    "total_pages": 6,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Color+vision&page=4&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Color+vision&page=2&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-22T20:13:55.856Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT03518775",
      "title": "Repeatability and Reproducibility of the IOLMaster 700 Vers 1.70 and Agreement With IOLMaster 700 Vers. 1.50 and Pentacam",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cornea"
      ],
      "interventions": [
        {
          "name": "Biometry",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Carl Zeiss Meditec, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "22 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "22 Years and older"
      },
      "enrollment_count": 98,
      "start_date": "2018-03-16",
      "completion_date": "2018-04-20",
      "has_results": false,
      "last_update_posted_date": "2018-05-31",
      "last_synced_at": "2026-10-22T20:13:55.856Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03518775"
    },
    {
      "nct_id": "NCT04124029",
      "title": "Contributions of mTBI to Neurodegeneration Due to Chronic Traumatic Encephalopathy (CTE) and Alzheimer's Disease (AD)",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Mild Traumatic Brain Injury",
        "Moderate Traumatic Brain Injury",
        "Mild Cognitive Impairment"
      ],
      "interventions": [
        {
          "name": "No Intervention is used for this study but all subjects will be asked to complete electroencephalogram (EEG) testing and an MRI scan.",
          "type": "DEVICE"
        },
        {
          "name": "No intervention is used for this study but all subjects will be asked to complete a venous blood draw procedure and a lumbar puncture procedure.",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DEVICE",
        "PROCEDURE"
      ],
      "sponsor": "VA Office of Research and Development",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": "90 Years",
        "sex": "ALL",
        "summary": "30 Years to 90 Years"
      },
      "enrollment_count": 800,
      "start_date": "2021-07-01",
      "completion_date": "2026-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-09-01",
      "last_synced_at": "2026-10-22T20:13:55.856Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04124029"
    },
    {
      "nct_id": "NCT04453033",
      "title": "DB RCT for Specialized Phototherapy in Parkinson's Disease.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Parkinson Disease"
      ],
      "interventions": [
        {
          "name": "Celeste Specialized Phototherapy Device",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "PhotoPharmics, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "45 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "45 Years and older"
      },
      "enrollment_count": 350,
      "start_date": "2024-02-26",
      "completion_date": "2026-08-30",
      "has_results": false,
      "last_update_posted_date": "2026-09-17",
      "last_synced_at": "2026-10-22T20:13:55.856Z",
      "location_count": 1,
      "location_summary": "Rochester, New York",
      "locations": [
        {
          "city": "Rochester",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04453033"
    },
    {
      "nct_id": "NCT02282111",
      "title": "EUS-CNB Versus EUS-SINK for Diagnosis of Upper Gastrointestinal (UGI) Subepithelial Tumors",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Esophageal Subepithelial Lesions"
      ],
      "interventions": [
        {
          "name": "22-gauge Procore needle (ProCore, Cook Medical Inc., Winston-Salem, NC)",
          "type": "DEVICE"
        },
        {
          "name": "conventional needle-knife sphincterotome (Microknife XL; Boston Scientific Inc, Natick, Mass)",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Johns Hopkins University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "100 Years",
        "sex": "ALL",
        "summary": "18 Years to 100 Years"
      },
      "enrollment_count": 56,
      "start_date": "2014-07",
      "completion_date": "2017-11",
      "has_results": true,
      "last_update_posted_date": "2018-10-09",
      "last_synced_at": "2026-10-22T20:13:55.856Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02282111"
    },
    {
      "nct_id": "NCT05713981",
      "title": "The Impact of Dry Eye Syndrome on Metrics of Low Contrast Vision Before and After Meibomian Gland Expression",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Meibomian Gland Dysfunction"
      ],
      "interventions": [
        {
          "name": "Meibomian gland (MG) expression",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "University of the Incarnate Word",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 40,
      "start_date": "2023-03-01",
      "completion_date": "2023-06-08",
      "has_results": false,
      "last_update_posted_date": "2023-06-26",
      "last_synced_at": "2026-10-22T20:13:55.856Z",
      "location_count": 1,
      "location_summary": "San Antonio, Texas",
      "locations": [
        {
          "city": "San Antonio",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05713981"
    },
    {
      "nct_id": "NCT05966532",
      "title": "Emotional Cognition: Establishing Constructs and Neural-Behavioral Mechanisms in Older Adults With Depression",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Major Depressive Disorder (MDD)",
        "Healthy Adult Volunteer"
      ],
      "interventions": [
        {
          "name": "Hot Cognitive Task",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Cold cognitive tasks",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Structural magnetic resonance imaging (sMRI)",
          "type": "OTHER"
        },
        {
          "name": "Magnetoencephalography imaging (MEG)",
          "type": "OTHER"
        },
        {
          "name": "four self-report forms per the requirement of the NIH Common Data Elements project",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Four self-report measures to assess interpersonal functioning",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Clinical assessments",
          "type": "BEHAVIORAL"
        },
        {
          "name": "ATHF",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL",
        "OTHER"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "21 Years to 80 Years"
      },
      "enrollment_count": 276,
      "start_date": "2023-12-11",
      "completion_date": "2027-08-31",
      "has_results": false,
      "last_update_posted_date": "2026-07-30",
      "last_synced_at": "2026-10-22T20:13:55.856Z",
      "location_count": 2,
      "location_summary": "Arlington, Texas • Dallas, Texas",
      "locations": [
        {
          "city": "Arlington",
          "state": "Texas"
        },
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05966532"
    },
    {
      "nct_id": "NCT03644914",
      "title": "Enhancing Reading Skills in 1st Grade Children",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Literacy"
      ],
      "interventions": [
        {
          "name": "10-week Reading Program",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Columbia University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "7 Years",
        "sex": "ALL",
        "summary": "6 Years to 7 Years"
      },
      "enrollment_count": 24,
      "start_date": "2019-02-15",
      "completion_date": "2019-06-30",
      "has_results": false,
      "last_update_posted_date": "2019-07-09",
      "last_synced_at": "2026-10-22T20:13:55.856Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03644914"
    },
    {
      "nct_id": "NCT00564902",
      "title": "The Zeaxanthin and Visual Function Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Age Related Macular Degeneration",
        "Cognition Disorders"
      ],
      "interventions": [
        {
          "name": "3R 3'R Zeaxanthin",
          "type": "DRUG"
        },
        {
          "name": "Lutein",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Lutein and Zeaxanthin",
          "type": "DIETARY_SUPPLEMENT"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIETARY_SUPPLEMENT"
      ],
      "sponsor": "Chrysantis, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "45 Years",
        "maximum_age": "90 Years",
        "sex": "ALL",
        "summary": "45 Years to 90 Years"
      },
      "enrollment_count": 60,
      "start_date": "2007-11",
      "completion_date": "2009-06",
      "has_results": true,
      "last_update_posted_date": "2012-03-29",
      "last_synced_at": "2026-10-22T20:13:55.856Z",
      "location_count": 1,
      "location_summary": "North Chicago, Illinois",
      "locations": [
        {
          "city": "North Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00564902"
    },
    {
      "nct_id": "NCT04371419",
      "title": "COVID-19 Health Messaging to Underserved Communities",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Coronavirus"
      ],
      "interventions": [
        {
          "name": "Messaging",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "National Bureau of Economic Research, Inc.",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 14267,
      "start_date": "2020-05-13",
      "completion_date": "2020-05-26",
      "has_results": true,
      "last_update_posted_date": "2021-07-27",
      "last_synced_at": "2026-10-22T20:13:55.856Z",
      "location_count": 1,
      "location_summary": "Cambridge, Massachusetts",
      "locations": [
        {
          "city": "Cambridge",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04371419"
    },
    {
      "nct_id": "NCT07218835",
      "title": "Compact Auto-Aligning Multi-Modal Eye Imaging to Diagnose Traumatic Eye Injury",
      "overall_status": "NOT_YET_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Ocular Pathologies"
      ],
      "interventions": [
        {
          "name": "Auto-aligning Ocular imaging instrument",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Duke University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 70,
      "start_date": "2026-09",
      "completion_date": "2026-12-30",
      "has_results": false,
      "last_update_posted_date": "2026-02-24",
      "last_synced_at": "2026-10-22T20:13:55.856Z",
      "location_count": 1,
      "location_summary": "Durham, North Carolina",
      "locations": [
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07218835"
    }
  ]
}