The Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study
Public ClinicalTrials.gov record NCT00000155. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
To describe the clinical course of keratoconus and to describe the relationships among its visual and physiological manifestations, including high- and low-contrast visual acuity, corneal curvature, slit lamp biomicroscopic findings, corneal scarring, and quality of life. To identify risk factors and protective factors that influence the severity and progression of keratoconus.
Study identification
- NCT ID
- NCT00000155
- Recruitment status
- Not listed
- Study type
- Observational
- Phase
- Not listed
- Enrollment
- Not listed
Conditions and interventions
Conditions
Interventions
Not listed
Eligibility (public fields only)
- Age range
- 12 Years and older
- Sex
- All
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Jun 1995 (Type not available)
- Primary completion
- Not listed
- Completion
- Not listed
- Last update posted
- Jun 24, 2005
Started 1995
United States locations
- U.S. sites
- 14
- U.S. states
- 10
- U.S. cities
- 14
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| University of California, Berkeley, School of Optometry | Berkeley | California | 94720-2020 | — |
| Southern California College of Optometry | Fullerton | California | 92831 | — |
| Jules Stein Eye Institute, University of California at Los Angeles | Los Angeles | California | 90095-7003 | — |
| Nova Southeastern University, Health Professions Division, College of Optometry | Fort Lauderdale | Florida | 33328 | — |
| University of Illinois at Chicago, Department of Ophthalmology and Visual Sciences | Chicago | Illinois | 60612 | — |
| Indiana University, School of Optometry | Bloomington | Indiana | 47405-3680 | — |
| University of Missouri-St. Louis, School of Optometry | St Louis | Missouri | 63121 | — |
| SUNY State College of Optometry | New York | New York | 10036-8003 | — |
| University Hospitals of Cleveland, Department of Ophthalmology | Cleveland | Ohio | 44106 | — |
| The Ohio State University, College of Optometry | Columbus | Ohio | 43210-1240 | — |
| Pennsylvania College of Optometry, The Eye Institute | Philadelphia | Pennsylvania | 19141 | — |
| Northeastern Eye Institute | Scranton | Pennsylvania | 18503 | — |
| University of Utah, John Moran Eye Center | Salt Lake City | Utah | 84132 | — |
| Gundersen Lutheran | La Crosse | Wisconsin | 54601 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT00000155, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Jun 24, 2005 · Synced Oct 26, 2026
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Open the official record
The complete public registry record, listed eligibility criteria, and available contact information for NCT00000155 live on ClinicalTrials.gov.