Medical Information Only. Always consult your healthcare provider before enrolling in any clinical trial.
NCT03478865 · ClinicalTrials.gov registry record · Early Phase 1
Vitamin A Palmitate Supplementation in People With Age-Related Macular Degeneration (and Without Reticular Pseudodrusen) and Delayed Dark Adaptation
A Early Phase 1 study, sponsored by National Eye Institute (NEI).
- Completed
- Registry status
- Early Phase 1
- Development phase
- 8
- Enrollment target
NCT03478865: Completed Early Phase 1 study, sponsored by National Eye Institute (NEI).
NCT03478865 is a Early Phase 1 study that has completed, run by National Eye Institute (NEI). The registered enrollment target is 8 participants, below the 53-participant average among 2,764 other Early Phase 1 trials with a reported enrollment target (85% lower). According to ClinicalTrials.gov, the official US trial registry.
The verdict
NCT03478865, a Early Phase 1 study, has completed, sponsored by National Eye Institute (NEI).
- COMPLETED
- Registry status
- Early Phase 1
- Development phase
- 8 participants
- Enrollment target
Study Summary
Background: Age-related macular degeneration (AMD) is an eye disease. It is the leading cause of vision loss in people over 55 in the U.S. Changes in the eye can make it difficult for the eye to adjust to low light. This is known as dark adaptation. Identifying and watching the early to middle stages of AMD and changes in dark adaptation might help researchers develop new treatments to stop the disease before it becomes severe. Taking vitamin A might help improve vision in people with AMD. Objectives: To see if taking 16,000 IU of vitamin A per day improves vision in people with AMD. Also to improve understanding of AMD and associated dark adaptation. Eligibility: Adults ages 50 and older with AMD and normal liver function Design: Participants will be screened with: Medical and eye disease history Eye exam: The pupil will be dilated with eye drops. Pictures will be taken of the retina and the inside of the eye. Including the screening visit, participants will have at least 5 visits. They will be about once a month over 6 months. Visits include: Questions about eye problems in certain light Eye exam Blood and urine tests Dark adaptation protocol: Participants will sit at a machine in a dark room. They will look into the machine and push a button when they see a light. This lasts 20-30 minutes. Participants will take a vitamin A supplement by mouth once a day for 2 months. They will record when they take the pills in a diary.
Primary Outcome
The mean change in rod intercept time (RIT) in the study eye at the treatment completion visit from baseline was descriptively summarized and assessed using a Student's paired t-test at a two-sided Type I error rate of 5%.
Interventions
- DRUG Vitamin A palmitate
Trial Details
| Field | Value |
|---|---|
| Enrollment Target | 8 participants |
| Start Date | 2018-04-20 |
| Est. Completion | 2023-06-16 |
| Phase | Early Phase 1 |
What the finished NCT03478865 record still lists
NCT03478865 is an interventional study that assigns participants to a tested intervention. The registry caps enrollment at 8 participants, a relatively small participant target, below the 53-participant average among 2,764 other Early Phase 1 trials with a reported enrollment target (85% lower).
The record links to 0 conditions, and to 1 intervention - of which Vitamin A palmitate is the first listed.
NCT03478865 does not publish any study locations in the registry export this page uses.
Frequently Asked Questions
What is clinical trial NCT03478865 about?
NCT03478865 is a clinical study titled "Vitamin A Palmitate Supplementation in People With Age-Related Macular Degeneration (and Without Reticular Pseudodrusen) and Delayed Dark Adaptation". Background: Age-related macular degeneration (AMD) is an eye disease. It is the leading cause of vision loss in people over 55 in the U.S. Changes in the eye can make it difficult for the eye to adjust to low light. This is known as dark adaptation. Identifying and watching the early to middle stag...
What is the current status of trial NCT03478865?
This trial is currently completed. It is a Early Phase 1 study. The enrollment target is 8 participants. The study started on 2018-04-20. Estimated completion is 2023-06-16.
What interventions are being tested in trial NCT03478865?
The interventions under investigation include: Vitamin A palmitate (DRUG).
Who is sponsoring clinical trial NCT03478865?
This trial is sponsored by National Eye Institute (NEI), which has 221 total clinical trials registered on ClinicalTrials.gov.
Learn More About Clinical Trials
How this trial's enrollment target compares
Where NCT03478865's enrollment target sits among peer trials
8 1783rd of 2000 higher than 176 of 2,000 other Early Phase 1 trials
participants (enrollment target), bucketed by value
Each bar is a band; taller bars hold more other Early Phase 1 trials. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source ClinicalTrials.gov registry export · 2026-08-08
Nationwide trials with similar profiles
Cross-condition peers matched on enrollment target and registry start date, not the same-condition list above.
Similar registry start date
- NCT05962346 · started 2026-12 · NA
Fetal Endoscopic Tracheal Occlusion for Congenital Diaphragmatic Hernia
- NCT07125183 · started 2026-12 · Phase 2
Study on Efficacy and Tolerability of Weekly Doxorubicin in Elderly Patients With Advanced or Metastatic Leiomyosarcoma
- NCT07292298 · started 2026-11 · Phase 2
Phase 2 Single-Arm Rectal Cancer Brachytherapy for Patients With Low-Lying Residual Adenocarcinoma After Total Neoadjuvant Therapy to Improve Organ Preservation Rates
- NCT04263285 · started 2026-10 · NA
Treatment of Depression Post-SCI