{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Refractive+Error&page=4",
    "query": {
      "intervention": "Refractive Error",
      "page": 4
    },
    "page_size": 10
  },
  "pagination": {
    "page": 4,
    "page_size": 10,
    "total_count": 75,
    "total_pages": 8,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Refractive+Error&page=5&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Refractive+Error&page=3&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-20T17:16:58.352Z",
  "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": "NCT01598818",
      "title": "First-Sight Refractive Error Correction in the Developing World",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Vision Loss"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Nebraska",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "7 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "7 Years to 50 Years"
      },
      "enrollment_count": 150,
      "start_date": "2012-05-11",
      "completion_date": "2014-01-13",
      "has_results": false,
      "last_update_posted_date": "2023-09-01",
      "last_synced_at": "2026-10-20T17:16:58.352Z",
      "location_count": 1,
      "location_summary": "Omaha, Nebraska",
      "locations": [
        {
          "city": "Omaha",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01598818"
    },
    {
      "nct_id": "NCT01706991",
      "title": "Amblyopia and Strabismus Detection Using a Pediatric Vision Scanner",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Amblyopia",
        "Strabismus"
      ],
      "interventions": [
        {
          "name": "Pediatric Vision Scanner eye scan",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Rebiscan, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "6 Months",
        "maximum_age": "6 Years",
        "sex": "ALL",
        "summary": "6 Months to 6 Years"
      },
      "enrollment_count": 32,
      "start_date": "2011-01",
      "completion_date": "2011-06",
      "has_results": false,
      "last_update_posted_date": "2012-10-15",
      "last_synced_at": "2026-10-20T17:16:58.352Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01706991"
    },
    {
      "nct_id": "NCT01655420",
      "title": "Patient Reported Outcomes With LASIK: PROWL-2",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Laser in Situ Keratomileusis"
      ],
      "interventions": [
        {
          "name": "LASIK",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Food and Drug Administration (FDA)",
      "sponsor_class": "FED",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "84 Years",
        "sex": "ALL",
        "summary": "21 Years to 84 Years"
      },
      "enrollment_count": 300,
      "start_date": "2012-07",
      "completion_date": null,
      "has_results": false,
      "last_update_posted_date": "2018-02-08",
      "last_synced_at": "2026-10-20T17:16:58.352Z",
      "location_count": 5,
      "location_summary": "Stanford, California • Indianapolis, Indiana • Overland Park, Kansas + 2 more",
      "locations": [
        {
          "city": "Stanford",
          "state": "California"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "Overland Park",
          "state": "Kansas"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Sioux Falls",
          "state": "South Dakota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01655420"
    },
    {
      "nct_id": "NCT03669146",
      "title": "Enhancement of Emmetropization in Highly Hyperopic Infants",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hyperopia"
      ],
      "interventions": [
        {
          "name": "Glasses",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Donald O Mutti, OD, PhD",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "8 Weeks",
        "maximum_age": "15 Weeks",
        "sex": "ALL",
        "summary": "8 Weeks to 15 Weeks"
      },
      "enrollment_count": 35,
      "start_date": "2019-04-24",
      "completion_date": "2023-01-05",
      "has_results": true,
      "last_update_posted_date": "2024-07-09",
      "last_synced_at": "2026-10-20T17:16:58.352Z",
      "location_count": 1,
      "location_summary": "Columbus, Ohio",
      "locations": [
        {
          "city": "Columbus",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03669146"
    },
    {
      "nct_id": "NCT05611294",
      "title": "Contralateral Study of Topography Guided LASIK Versus Small Incision Lenticule Extraction",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Myopia",
        "Astigmatism"
      ],
      "interventions": [
        {
          "name": "Topography Guided LASIK Surgery",
          "type": "DEVICE"
        },
        {
          "name": "Small Incision Lenticule Extraction Surgery",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Hoopes Vision",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "22 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "22 Years to 50 Years"
      },
      "enrollment_count": 42,
      "start_date": "2022-09-27",
      "completion_date": "2025-06-01",
      "has_results": false,
      "last_update_posted_date": "2024-08-01",
      "last_synced_at": "2026-10-20T17:16:58.352Z",
      "location_count": 1,
      "location_summary": "Draper, Utah",
      "locations": [
        {
          "city": "Draper",
          "state": "Utah"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05611294"
    },
    {
      "nct_id": "NCT01675479",
      "title": "Safety and Effectiveness of Wavefront-Guided LASIK Correction of Hyperopic Refractive Errors",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hyperopia"
      ],
      "interventions": [
        {
          "name": "LASIK correction of hyperopic refractive errors",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Abbott Medical Optics",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 167,
      "start_date": "2012-12-31",
      "completion_date": "2016-10-31",
      "has_results": true,
      "last_update_posted_date": "2021-12-15",
      "last_synced_at": "2026-10-20T17:16:58.352Z",
      "location_count": 9,
      "location_summary": "Los Angeles, California • Miami, Florida • Chicago, Illinois + 6 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Miami",
          "state": "Florida"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Chesterfield",
          "state": "Missouri"
        },
        {
          "city": "Kansas City",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01675479"
    },
    {
      "nct_id": "NCT05070767",
      "title": "Neurolens Headache Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Binocular Vision Disorder",
        "Convergence Insufficiency",
        "Headache",
        "Computer Vision Syndrome"
      ],
      "interventions": [
        {
          "name": "Neurolens spectacle lens",
          "type": "DEVICE"
        },
        {
          "name": "Placebo spectacle lens",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Neurolens Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "18 Years to 60 Years"
      },
      "enrollment_count": 300,
      "start_date": "2021-10-18",
      "completion_date": "2022-05-30",
      "has_results": false,
      "last_update_posted_date": "2023-10-12",
      "last_synced_at": "2026-10-20T17:16:58.352Z",
      "location_count": 10,
      "location_summary": "Phoenix, Arizona • Conyers, Georgia • Perry, Georgia + 7 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Conyers",
          "state": "Georgia"
        },
        {
          "city": "Perry",
          "state": "Georgia"
        },
        {
          "city": "Rigby",
          "state": "Idaho"
        },
        {
          "city": "Lincoln",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05070767"
    },
    {
      "nct_id": "NCT00396188",
      "title": "Screening Aid to Identify Corneas That May Have Pathologies or Other Conditions",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Corneal Diseases"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Carl Zeiss Meditec, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 769,
      "start_date": "2007-02",
      "completion_date": "2008-02",
      "has_results": false,
      "last_update_posted_date": "2015-08-17",
      "last_synced_at": "2026-10-20T17:16:58.352Z",
      "location_count": 4,
      "location_summary": "La Jolla, California • San Diego, California • Greenwood Village, Colorado + 1 more",
      "locations": [
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Greenwood Village",
          "state": "Colorado"
        },
        {
          "city": "Forest Grove",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00396188"
    },
    {
      "nct_id": "NCT03929588",
      "title": "Study of a Hand-held Device Plus Mobile App Versus Standard Eye Care Devices in Measuring Refractive Error of the Eye",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Refractive Errors",
        "Astigmatism"
      ],
      "interventions": [
        {
          "name": "Hand-held device supported by a mobile application",
          "type": "DEVICE"
        },
        {
          "name": "Phoropter",
          "type": "DEVICE"
        },
        {
          "name": "Autorefractor",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "EyeQue Corp.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "30 Years to 65 Years"
      },
      "enrollment_count": 230,
      "start_date": "2019-05-07",
      "completion_date": "2020-03-31",
      "has_results": true,
      "last_update_posted_date": "2022-03-24",
      "last_synced_at": "2026-10-20T17:16:58.352Z",
      "location_count": 1,
      "location_summary": "Inglewood, California",
      "locations": [
        {
          "city": "Inglewood",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03929588"
    },
    {
      "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": "2026-10-20T17:16:58.352Z",
      "location_count": 1,
      "location_summary": "Harlingen, Texas",
      "locations": [
        {
          "city": "Harlingen",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06812572"
    }
  ]
}