{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Progressive+addition+lens+spectacles",
    "query": {
      "intervention": "Progressive addition lens spectacles"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 5,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-17T05:11:15.214Z",
  "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": "NCT01234207",
      "title": "Clinical Assessment of a Customized Free-form Progressive Addition Lens Spectacle",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Presbyopia"
      ],
      "interventions": [
        {
          "name": "Standard, non-free-form, non-customized PAL spectacles",
          "type": "DEVICE"
        },
        {
          "name": "Individually customized free-form surfaced PAL spectacles",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "University of California, Berkeley",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "39 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "39 Years to 80 Years"
      },
      "enrollment_count": 95,
      "start_date": "2009-02",
      "completion_date": "2009-10",
      "has_results": true,
      "last_update_posted_date": "2017-04-18",
      "last_synced_at": "2026-09-17T05:11:15.214Z",
      "location_count": 1,
      "location_summary": "Berkeley, California",
      "locations": [
        {
          "city": "Berkeley",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01234207"
    },
    {
      "nct_id": "NCT00585026",
      "title": "Randomized Clinical Trial of Bifocal Lenses Versus Computer-specific Progressive Addition Lenses",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Refractive Error",
        "Presbyopia",
        "Asthenopia",
        "Eyeglasses"
      ],
      "interventions": [
        {
          "name": "D-28 bifocal lenses and frame",
          "type": "DEVICE"
        },
        {
          "name": "Progressive addition computer lenses and frame",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "University of Alabama at Birmingham",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "40 Years and older"
      },
      "enrollment_count": 40,
      "start_date": "2006-10",
      "completion_date": "2007-06",
      "has_results": false,
      "last_update_posted_date": "2011-06-15",
      "last_synced_at": "2026-09-17T05:11:15.214Z",
      "location_count": 1,
      "location_summary": "Birmingham, Alabama",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00585026"
    },
    {
      "nct_id": "NCT03757039",
      "title": "Multifocal Visual Performance Study",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Presbyopia"
      ],
      "interventions": [
        {
          "name": "Multifocal soft contact lenses",
          "type": "DEVICE"
        },
        {
          "name": "Progressive addition lens spectacles",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DEVICE",
        "OTHER"
      ],
      "sponsor": "Alcon Research",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "38 Years",
        "maximum_age": "58 Years",
        "sex": "ALL",
        "summary": "38 Years to 58 Years"
      },
      "enrollment_count": 42,
      "start_date": "2018-12-16",
      "completion_date": "2019-03-06",
      "has_results": true,
      "last_update_posted_date": "2020-03-25",
      "last_synced_at": "2026-09-17T05:11:15.214Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03757039"
    },
    {
      "nct_id": "NCT00335049",
      "title": "Study of Theories About Myopia Progression (STAMP)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Myopia"
      ],
      "interventions": [
        {
          "name": "progressive addition spectacle lens (bifocal)",
          "type": "DEVICE"
        },
        {
          "name": "Single Vision Lenses (SVLs)",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Ohio State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "11 Years",
        "sex": "ALL",
        "summary": "6 Years to 11 Years"
      },
      "enrollment_count": 85,
      "start_date": "2006-12",
      "completion_date": "2010-07",
      "has_results": false,
      "last_update_posted_date": "2022-10-28",
      "last_synced_at": "2026-09-17T05:11:15.214Z",
      "location_count": 1,
      "location_summary": "Columbus, Ohio",
      "locations": [
        {
          "city": "Columbus",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00335049"
    },
    {
      "nct_id": "NCT03123822",
      "title": "Spectacles Lens in Concussed Kids",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Concussion, Mild",
        "Convergence Insufficiency",
        "Accommodation; Insufficiency"
      ],
      "interventions": [
        {
          "name": "Glasses",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "University of Alabama at Birmingham",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "9 Years",
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "9 Years to 17 Years"
      },
      "enrollment_count": 10,
      "start_date": "2017-10-31",
      "completion_date": "2021-10-01",
      "has_results": true,
      "last_update_posted_date": "2022-06-23",
      "last_synced_at": "2026-09-17T05:11:15.214Z",
      "location_count": 1,
      "location_summary": "Birmingham, Alabama",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03123822"
    }
  ]
}