{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=tonometer&page=2",
    "query": {
      "intervention": "tonometer",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 10,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=tonometer&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-09-05T15:43:53.640Z",
  "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": "NCT03275142",
      "title": "Icare Tonometry Effects on Keratometry Readings, Topography Readings, and Corneal Staining",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Evaluation of Corneal Stability Post-applanation"
      ],
      "interventions": [
        {
          "name": "Icare tonometer",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Comprehensive EyeCare of Central Ohio",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 60,
      "start_date": "2017-06-19",
      "completion_date": "2018-07-31",
      "has_results": false,
      "last_update_posted_date": "2019-01-30",
      "last_synced_at": "2026-09-05T15:43:53.640Z",
      "location_count": 1,
      "location_summary": "Westerville, Ohio",
      "locations": [
        {
          "city": "Westerville",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03275142"
    },
    {
      "nct_id": "NCT05523622",
      "title": "Comparison of Intraocular Pressure Measurement With the Novel TonoVera Device With Other Commonly Used Devices",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Glaucoma"
      ],
      "interventions": [
        {
          "name": "Tono-Vera tonometer",
          "type": "DEVICE"
        },
        {
          "name": "Goldman Applanation Tonometry",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "State University of New York at Buffalo",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 300,
      "start_date": "2022-08-01",
      "completion_date": "2027-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-05-06",
      "last_synced_at": "2026-09-05T15:43:53.640Z",
      "location_count": 1,
      "location_summary": "Buffalo, New York",
      "locations": [
        {
          "city": "Buffalo",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05523622"
    },
    {
      "nct_id": "NCT02990169",
      "title": "Clinical Evaluation of CATS Tonometer Prism",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Ocular Hypotension"
      ],
      "interventions": [
        {
          "name": "CATS tonometer prism",
          "type": "DEVICE"
        },
        {
          "name": "Goldmann Tonometer prism",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Intuor Technologies, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 38,
      "start_date": "2017-01",
      "completion_date": "2018-10",
      "has_results": false,
      "last_update_posted_date": "2018-10-22",
      "last_synced_at": "2026-09-05T15:43:53.640Z",
      "location_count": 1,
      "location_summary": "Tucson, Arizona",
      "locations": [
        {
          "city": "Tucson",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02990169"
    },
    {
      "nct_id": "NCT03439774",
      "title": "Comparative Study of the Topcon Tonometers CT-800 and TRK-2P and the Haag-Streit Goldmann Manual Tonometer and Topcon SP-1P",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Intraocular Pressure"
      ],
      "interventions": [
        {
          "name": "Topcon CT-800",
          "type": "DEVICE"
        },
        {
          "name": "Topcon TRK-2P",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Topcon Medical Systems, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 345,
      "start_date": "2017-05-05",
      "completion_date": "2018-06-30",
      "has_results": false,
      "last_update_posted_date": "2022-06-08",
      "last_synced_at": "2026-09-05T15:43:53.640Z",
      "location_count": 1,
      "location_summary": "Andover, Massachusetts",
      "locations": [
        {
          "city": "Andover",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03439774"
    },
    {
      "nct_id": "NCT02989909",
      "title": "Clinical Evaluation of CATS Tonometer Prism",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Ocular Hypertension"
      ],
      "interventions": [
        {
          "name": "CATS tonometer prism",
          "type": "DEVICE"
        },
        {
          "name": "Goldmann tonometer prism",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Intuor Technologies, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 86,
      "start_date": "2017-01",
      "completion_date": "2017-11",
      "has_results": false,
      "last_update_posted_date": "2018-08-08",
      "last_synced_at": "2026-09-05T15:43:53.640Z",
      "location_count": 1,
      "location_summary": "Tucson, Arizona",
      "locations": [
        {
          "city": "Tucson",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02989909"
    },
    {
      "nct_id": "NCT02416024",
      "title": "Arterial Stiffness and General Anesthesia Induced Hypotension in Patients on Angiotensin-converting Enzyme Inhibitors",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hypotension",
        "Arterial Stiffness"
      ],
      "interventions": [
        {
          "name": "SphygmoCor system",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "University of Iowa",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "85 Years",
        "sex": "ALL",
        "summary": "50 Years to 85 Years"
      },
      "enrollment_count": 72,
      "start_date": "2013-08",
      "completion_date": "2018-09",
      "has_results": false,
      "last_update_posted_date": "2019-03-18",
      "last_synced_at": "2026-09-05T15:43:53.640Z",
      "location_count": 1,
      "location_summary": "Iowa City, Iowa",
      "locations": [
        {
          "city": "Iowa City",
          "state": "Iowa"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02416024"
    },
    {
      "nct_id": "NCT06247072",
      "title": "TRK-3 Conformance to Standards for Tonometers",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Glaucoma"
      ],
      "interventions": [
        {
          "name": "Tonometer",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Topcon Corporation",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "22 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "22 Years and older"
      },
      "enrollment_count": 125,
      "start_date": "2024-02-02",
      "completion_date": "2024-04-04",
      "has_results": false,
      "last_update_posted_date": "2024-04-08",
      "last_synced_at": "2026-09-05T15:43:53.640Z",
      "location_count": 2,
      "location_summary": "La Mesa, California • Chicago, Illinois",
      "locations": [
        {
          "city": "La Mesa",
          "state": "California"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06247072"
    },
    {
      "nct_id": "NCT06250868",
      "title": "TRK-3 Performance of Pachymetry",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Normal"
      ],
      "interventions": [
        {
          "name": "Kerato-Refracto Tonometer",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Topcon Corporation",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "22 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "22 Years and older"
      },
      "enrollment_count": 30,
      "start_date": "2024-02-20",
      "completion_date": "2024-02-26",
      "has_results": false,
      "last_update_posted_date": "2024-03-01",
      "last_synced_at": "2026-09-05T15:43:53.640Z",
      "location_count": 1,
      "location_summary": "La Jolla, California",
      "locations": [
        {
          "city": "La Jolla",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06250868"
    },
    {
      "nct_id": "NCT04360369",
      "title": "Comparison of Intraocular Pressure Measurements Between Reichert Tono-Vera Tonometer and Goldmann Tonometry",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Intraocular Pressure",
        "Glaucoma"
      ],
      "interventions": [
        {
          "name": "IOP with Goldmann Applanation Tonometer",
          "type": "DEVICE"
        },
        {
          "name": "IOP with comparator ORA G3 and ic100 tonometers",
          "type": "DEVICE"
        },
        {
          "name": "IOP with Tono-Vera Tonometer",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Reichert, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "90 Years",
        "sex": "ALL",
        "summary": "18 Years to 90 Years"
      },
      "enrollment_count": 61,
      "start_date": "2020-10-19",
      "completion_date": "2021-04-28",
      "has_results": false,
      "last_update_posted_date": "2022-01-03",
      "last_synced_at": "2026-09-05T15:43:53.640Z",
      "location_count": 1,
      "location_summary": "Durham, North Carolina",
      "locations": [
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04360369"
    },
    {
      "nct_id": "NCT07298356",
      "title": "Automated Applanation Tonometry - Updated",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Glaucoma",
        "Glaucoma, Suspect"
      ],
      "interventions": [
        {
          "name": "Standard GAT",
          "type": "DEVICE"
        },
        {
          "name": "Fixed force GAT",
          "type": "DEVICE"
        },
        {
          "name": "Upright applanating prototype",
          "type": "DEVICE"
        },
        {
          "name": "Pneumotonometer",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Duke University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 200,
      "start_date": "2026-03-02",
      "completion_date": "2026-12-29",
      "has_results": false,
      "last_update_posted_date": "2026-03-06",
      "last_synced_at": "2026-09-05T15:43:53.640Z",
      "location_count": 1,
      "location_summary": "Durham, North Carolina",
      "locations": [
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07298356"
    }
  ]
}