Neurosensory Abnormalities in SymptomAtic Ocular Surface Patients (NASA)
Public ClinicalTrials.gov record NCT04838223. 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.
Study identification
- NCT ID
- NCT04838223
- Recruitment status
- Suspended
- Study type
- Observational
- Phase
- Not listed
- Lead sponsor
- Tufts Medical Center
- Other
- Enrollment
- 1,000 participants
Conditions and interventions
Conditions
Interventions
- Contact Lens Dry Eye Questionnaire-8 (CLDEQ-8) Optional; only for Contact Lens Wearers Other
- Hyperosmolar Response Other
- Ocular Pain Assessment Survey (OPAS) Other
- Proparacaine Challenge Test Other
- Visual Analogue Questionnaire Other
Other
Eligibility (public fields only)
- Age range
- 18 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
- Jul 1, 2021
- Primary completion
- Dec 30, 2025
- Completion
- Jun 30, 2026
- Last update posted
- Jan 26, 2026
2021 – 2026
United States locations
- U.S. sites
- 16
- U.S. states
- 11
- U.S. cities
- 13
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Canyon City Eye Care | Azusa | California | 91702 | — |
| Western University of Health Sciences | Pomona | California | 91766 | — |
| University of California at San Francisco - Francis I Proctor Foundation | San Francisco | California | 94143 | — |
| Bruce W. Carter VA Medical Center | Miami | Florida | 33125 | — |
| University of Illinois at Chicago | Chicago | Illinois | 60612 | — |
| Illinois College of Optometry | Chicago | Illinois | 60616 | — |
| Kannarr Eye Care | Pittsburg | Kansas | 66762 | — |
| University of Maryland | Baltimore | Maryland | 21201 | — |
| Tufts Medical Center | Boston | Massachusetts | 02111 | — |
| Korb & Associates | Boston | Massachusetts | 02215 | — |
| Midwest Vision Research Foundation at Prepose Vision Institute | St Louis | Missouri | 63128 | — |
| Ophthalmology Associates | St Louis | Missouri | 63131 | — |
| Vita Eye Clinic | Shelby | North Carolina | 28150 | — |
| SkyVision Centers | Westlake | Ohio | 44145 | — |
| Hospital of the University of Pennsylvania (Scheie Eye Institute Perelman) | Philadelphia | Pennsylvania | 19104 | — |
| Baylor College of Medicine | Houston | Texas | 77030 | — |
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 NCT04838223, 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 Jan 26, 2026 · Synced May 19, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT04838223 live on ClinicalTrials.gov.