{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Digital+refraction",
    "query": {
      "intervention": "Digital refraction"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 4,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-04T11:50:23.961Z",
  "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": "NCT01820117",
      "title": "Brain Integrity in Survivors of Hodgkin Lymphoma Treated With Thoracic Radiation",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hodgkin Lymphoma"
      ],
      "interventions": [
        {
          "name": "Neurocognitive Evaluation",
          "type": "OTHER"
        },
        {
          "name": "Quantitative Brain Imaging",
          "type": "OTHER"
        },
        {
          "name": "Neurologic Evaluation",
          "type": "OTHER"
        },
        {
          "name": "Health Questionnaire",
          "type": "OTHER"
        },
        {
          "name": "Vascular Testing",
          "type": "OTHER"
        },
        {
          "name": "Cardiopulmonary Exercise Testing",
          "type": "OTHER"
        },
        {
          "name": "Echocardiography",
          "type": "OTHER"
        },
        {
          "name": "Pulmonary Function Testing",
          "type": "OTHER"
        },
        {
          "name": "Serum Biomarkers",
          "type": "PROCEDURE"
        },
        {
          "name": "Ophthalmology Examination",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER",
        "PROCEDURE"
      ],
      "sponsor": "St. Jude Children's Research Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 416,
      "start_date": "2013-04-26",
      "completion_date": "2018-02-20",
      "has_results": false,
      "last_update_posted_date": "2018-03-01",
      "last_synced_at": "2026-09-04T11:50:23.961Z",
      "location_count": 1,
      "location_summary": "Memphis, Tennessee",
      "locations": [
        {
          "city": "Memphis",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01820117"
    },
    {
      "nct_id": "NCT06812572",
      "title": "A Prospective Clinical Study to Evaluate the Repeatability of the Visibly Vision Test",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Myopia",
        "Astigmatism"
      ],
      "interventions": [
        {
          "name": "Visibly Vision Test",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Visibly",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "22 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "22 Years to 55 Years"
      },
      "enrollment_count": 25,
      "start_date": "2019-03-04",
      "completion_date": "2019-03-25",
      "has_results": false,
      "last_update_posted_date": "2025-02-06",
      "last_synced_at": "2026-09-04T11:50:23.961Z",
      "location_count": 1,
      "location_summary": "Harlingen, Texas",
      "locations": [
        {
          "city": "Harlingen",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06812572"
    },
    {
      "nct_id": "NCT03502863",
      "title": "Clinical Study to Evaluate Effectiveness of Digital Refraction",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Myopia",
        "Astigmatism"
      ],
      "interventions": [
        {
          "name": "Digital refraction",
          "type": "DEVICE"
        },
        {
          "name": "Manual Refraction",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DEVICE",
        "OTHER"
      ],
      "sponsor": "Visibly",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "22 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "22 Years to 55 Years"
      },
      "enrollment_count": 102,
      "start_date": "2018-04-19",
      "completion_date": "2018-07-06",
      "has_results": false,
      "last_update_posted_date": "2018-10-26",
      "last_synced_at": "2026-09-04T11:50:23.961Z",
      "location_count": 3,
      "location_summary": "Fort Lauderdale, Florida • Nashville, Tennessee • Harlingen, Texas",
      "locations": [
        {
          "city": "Fort Lauderdale",
          "state": "Florida"
        },
        {
          "city": "Nashville",
          "state": "Tennessee"
        },
        {
          "city": "Harlingen",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03502863"
    },
    {
      "nct_id": "NCT05259163",
      "title": "LFR-260 vs Traditional Phoropter in Visual Acuity Testing",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Visual Acuity",
        "Astigmatism",
        "Anisometropia"
      ],
      "interventions": [
        {
          "name": "LFR-260 portable phoropter",
          "type": "DEVICE"
        },
        {
          "name": "Traditional phoropter (SOC)",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Evolution Optiks Limited",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "12 Years to 65 Years"
      },
      "enrollment_count": 112,
      "start_date": "2022-06-07",
      "completion_date": "2023-01-06",
      "has_results": true,
      "last_update_posted_date": "2024-09-25",
      "last_synced_at": "2026-09-04T11:50:23.961Z",
      "location_count": 2,
      "location_summary": "Worcester, Massachusetts • Oyster Bay, New York",
      "locations": [
        {
          "city": "Worcester",
          "state": "Massachusetts"
        },
        {
          "city": "Oyster Bay",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05259163"
    }
  ]
}